Concept sprite, looking for opinions.

[Bombshell93]

leaning too far back, have the back leg stretching a little further so it looks like hes spreading his weight better (good for balance), also use the second pic the first one has a growth in its shoulder.
the red is also still showing off how poorly red shades, make the darker shade darker, the dark blue of the shorts also looks a bit too dark.
the shoulder also has a dark line I assume showing the deltoid, the deltoid will always be the entire shoulder but you've got that like acting as if its a tiny bit on top of the arm, if that were true not much would be keeping your arm from flailing around when your run.