Easily BDC's best piece, but I'm giving this to Chriss.
BDC - I don't know why you choose such large canvases all the time. My advice is to start off using, say, 450x200 and use just one or two renders. Learning to fill larger spaces will come in time. But anyway, the composition here is actually quite good and although the technique you used to blend the renders is basic, it still works on everyone but Nick Fury. There could also be some proper colouring and text that flows but overall I think this piece has more style than any of your other work, so you're improving.
Chriss - Even though this sig ticks almost all boxes, I'm still not as impressed as I should be, I think because the text is too distracting and there's too much red. But otherwise the composition is fantastic, and the shadowy foreground combined with the light source from behind makes this professional looking. Texture is a nice touch too.