I think red on the line of "scales" down his back as opposed to the brown. Also the top part of his thigh seems that it should be convex, rather then the concave you have drawn.
More muscle detail. May I suggest a "cat" eye? Meaning a verticle slit for a pupil?
And I think the feet need one more toe/claw, toward the back of the foot. Like a "thumb" more or less.
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