Late to this amazing project of yours, but wow, it looks like so much fun! It's like the most random fantastic battle ever :D My favorites for each of you are:

jsfunction

I just love your compositions and vivid colors, so bright and happy! That first one's cutout look is just lovely, and the colorful grunge of the latter two I am just awestruck with!

shameless666

The text of the first! Gosh, so well done. The second's composition is just all sorts of pretty and elegant and I love the similicity of the third so much. :D

thyla87

I just adore the framing and muted colors of the first one, it really is very apt for Steve! And the composition of the second and third are both so amazing, I just love the pink/black color scheme of the second so much as well!