I think the biggest thing you would want to look at improving is the contrast of the shading for the creatures green arm. The dark lines, especially right next white highlights, stands out a little bit to much. It clashes very much.
Bit nit-picky but Its a little bit hard to notice the transition of the creatures head to its arm. The position and shading makes it hard to differentiate the creatures back from his arm. (I am not very familar with the source creature, so maybe thats more what it looks like in his original design).
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I think the biggest thing you would want to look at improving is the contrast of the shading for the creatures green arm. The dark lines, especially right next white highlights, stands out a little bit to much. It clashes very much.
Bit nit-picky but Its a little bit hard to notice the transition of the creatures head to its arm. The position and shading makes it hard to differentiate the creatures back from his arm. (I am not very familar with the source creature, so maybe thats more what it looks like in his original design).