Had a crack at Turbo's Lineart.
I'm diggin' da lumps
. Really nice texture (must be a bit of a pain to texture that lumpy pattern individually). The colors are nice too, i get some "magic/fantasy" vibes from this blueish green. I love how the belly skin's texture looks altogether different from the rest of the body, the shininess of the surface. That twist on the lower half looks kind of odd... perhaps making the curve of the brighter skin part more pronounced would make it better? Also, adding some shadows cast from the arms of head on the torso would give it more depth. Those spots on the tail shading are nice too, but suggest a smoother texture, different than the one at the top (just a nitpick really).
I worked on this a bit more:
...
I'm still not sure how the light would fall on the bottom tail. I think when I figure that out it'll look better.
The scales' highlights add more depth, looking better, and the shading has improved. As Faktablad suggested, you could now start suggesting more volume, by making larger highlights where light strikes the surface with greater intensity, and smaller and smaller as it fades (fading near the edges of the body). Look at an orange, or think of a cilinder. The upper and middle torso would benefit this most, for they are the bulkier parts of the lizzard thing. I like your colors, but you could afterwards play with their saturations a bit and make a few hue shifts (make the highlights less saturated, shift the dark tones towards purple, or blue, etc), just for the fun of it
On the tail, you could just add some shading on the bottom and no highlights, or you could add a secondary light source, shining from below.