I REALLY LIKE THIS (first off). xD And I have a premium again, so I can write critiques again(yay!) so I'm taking advantage of it and hope that this helps you, Alexa-chan!<3
So first off(as a real critique point xD), I really like what you did with the concept here. Those who are fans of Teen Titans(and even those who aren't) can understand the feeling of darkness that surrounds this picture, which really works. The height difference works well in this picture as well, as it conveys the apprentice idea that you wanted to convey(and any good Teen Titans fan knows what this refers to lol).
Now for the constructive bit:
In terms of composition, I like that you aimed to do something that's a little bit different from your usual. It's not often that we see darker art from you, so this is nice and the left justification works well. The only problem with justification to one side where two people are standing is the imbalance of space. There's a lot of space in the top right hand corner and I don't really know what to make of it, especially since there's extra space even above Slade's head. Perhaps if you minimized the space a little bit or balanced it out with equal amount of space all around the characters(maintaining the left justification), it'd look a little less unbalanced. (But that's just me haha)
I really want to point out the color choice because it seems a little different from your usual palette. The dark red with the scratch/streak marks that darkens down to a black at the bottom works with the dark atmosphere in the picture, but it does get a bit overwhelming toward the bottom. The subtle texture is nice though, and I like that you included that in the background instead of just keeping it flat.
The reason why I say it's kinda overwhelming on the bottom is that Robin's cape is enveloping almost the entire bottom half of the drawing and the rest of Slade's neutral color palette is only adding on to that darkness. It's understandable you wouldn't want to add too much contrast, but I think you could have perhaps experimented more with lighting to make sure both Robin and Slade stood out more so they don't start blending into the background. I do commend you for attention to detail though, Alexa-chan! ^^ You got the band across Slade's outfit and the detail work on Robin's belt, which is nice.
Last bit are just small things~ I know it's more typical of your coloring style as you like to keep it relatively simple, but I think the colors just seem a bit flat, particularly in the context of this drawing. The yellow, red and green in this picture are just...stark versions of the colors they are. As in, the shading on them doesn't really deviate to show that light reflects onto other parts of the drawing or outfit or anything like that. I think you could have experimented a bit more with more shading and coloring instead of just making the colors straight up red, green and yellow. The same goes for the neutral colors as well, which could even use a bit more red or other colors for shading to show their fitting in with the surroundings.
I also think a bit more depth could have been added with the cape wrapping around Robin's neck, as with the current color scheme, it seems like his head is floating a little bit(but not completely). I really like what you did with his expression-it works just like it would have in the show! But I think you could have gone one step further with the hands as well, as they seem to lack a bit in structure around the fists.
Long critique is long xD sorry! But I hope you found this helpful and most of all, fair. >__<
Lovely work on this, Alexa-chan! Overall, I really like that you tried some new things here and were able to capture the apprentice-master relationship with this work! I don't see it a lot in fanart of Teen Titans and it's nice to see you take on something like that. ^^ I also really want to say that your style keeps in well with the show's style, so I love that bit.
Keep up the amazing arts, Alexa-chan!<3
OAO Aragorn, why is it so hard to find people who can write a critique like you?
Awww you are WAY too sweet!! >.< <3 Thank you, I appreciate that! haha
I wish I could write critiques this long more often, but sadly I can probably only do them once or twice a day. @__@ I typically write them in the comments section anyway haha but for the Critique widget thing I usually make them twice as long LOL. If you'd like me to do one for you on an art piece, just ask! ^^
Your welcome~(& I completely understand-it typically takes me about a day to write a good one T.T I get worried that I'm not being helpful enough & start hunting for tutorials/refs like crazy XD)
I'll consider your offer in the future (I chew myself out a lot to be honest); it's just that in a club I'm in someone asked for one & I felt bad because someone who was trying to do one simply wrote "nothing's wrong but it's just too bright"-it sounded kind of offensive. :/
Haha I'm glad you understand the feeling! xD I worry about not being helpful either...especially since I'm not big on posting tons of links for people to follow when I critique (mostly due to my being lazy OTL). >.<
I think every artist chews his/herself out a lot LOL.
As for that person getting that somewhat offensive critique...do you mind linking me to their work? I'll leave a nice long critique because that comment does seem kind of sad =/