I am really really trying hard to find something bad to say, but to no avail.
Ah yes, maybe the fact that one of your guys on the top poster seems to have an eye missing? Looks weird somehow.
Love the lighting and composition. The colours are good (the green shadows contrast nicely with the bright red lines and eyes). Nice work.
I suppose you could have chosen a more “orangy” shade of red (rather than a purplish shade) for your second poster, given how the greens are already going towards the blueish side of green. But really, that’s just to be nitpicking.
The stance is solid. And the lighting reinforces it, which is a really nice touch.