Looks like he is under water...reason?
Bubbles, starfish looking thing to the right of his head, oceanic caves in the BG.
Looks pretty cool, not really any flow in any direction kinda scattered.
Lighting is off...there should be lighting on the top f his helmet, but it's just the same.
mmmm and I can't think of anything else
P.S. Why is spidey's finger cut off?