hey, gimp has a smudge tool right? use it for softer, not too rigid like
Mouth too big
make it more glossy
cut and paste? i knew it (back of the head)
change the colours (darker green, green, brighter green)
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3/10, try your best next time
Gazorite, by c/p I think he means that you mirrored the half of the texture (nothing wrong with that.)
Try shading. Simple shading gives the impression of layers and depth (lighter for protruding parts, darker for inward parts.)
Robotic heads usually have more of a lustrous feel to them.
@gaz, it kinda looks like it, the bakc head part, those 2 horns (is it?) that's kinda located near the gills of a fish