well, im a beginner so take my comments lightly  :)      but i will write as i want to be critiqued

im assuming this to be a concept drawing, so things shouldnt have to be perfect?

for picture:

have the eyes, spikes, and bicep sizes match

maybe move the left hip in toward body and lean the left knee toward body as well

perhaps show a little more dark gray on the right elbow

for concept:

i assume the blue smoke is energy?

how is it created then...  is it from the blue emblems on the arms?

if so, then maybe change the color a little from that used on the chest and ankles, unless they will emit energy too

hope that helps some  :)

Nice!!

:o I listened it to it before I read your post.  So my first thought was "Attack?", not unless its a catfight at a stripclub.  :)        But then at the end I hear what you mean about the marching band.   Not bad 

I love it   :)