i'm not blind and i see u haven't used filters and the shading is drew with mouse...
i like something in this but it is a bit too bad quality and i see the spot where ends the line i think it should be filled with black...
hmmm (gimp is harder to use than ps) hand drawn so u get +3
see some mistakes -2
detailed and charismatic +4
good idea +2
a bit too abstract -2
i give u 5/10
for start it is pretty much u should try adding some "realistic" details like scratches or shining effect and u need to end those black lines
and bit reduce the brigtness of green colour in some places it ruins head a bit
btw gl with the set and finish it...
(this is only my opinion)