I did notice a few things, minor though they be, and I though you'd love me to pick them out for ya.
The ryu/ken pair on the marquee image look odd because they have a soft look compared to the hard edge outlined characters the on the CP and the rest of the marquee. Oh, and ken looks queer.
It would be nice if the text were more consistent over the whole design. The marquee text looks squashed horizontally compared to the overlay, and the sideart is different again.
Speaking of sideart text, it should have the same orientation on both sides. Whether it be angled or horizontal it just looks strange because they dont match. It looks as if they're covering the intersection of the images, but that shoudn't be too hard to fix.
The colour theme looks to be rich earthy tones, and the ryu/akuma image on the sideart doesn't fit it. Maybe a hue change on the bg could fix that.
(Oh yeah, remove the spiderman logo on the bottom left of his sideart image)
Other than those details, looks pretty solid Snaaake.