Basically all you need to do is smooth out the muscle from the human figure you use so there's no sign of muscle in the legs and arms make the joints thicker the body and limbs flatter with allot less muscle curvature once you do that you will have either make hands and feet or take the figure into Z-Brush and resculpt it there with hands and feet for a much better result.

You can can fix the sleestack head with the shoulders by using the grouping tool to block out the shoulders to make tranz-map to hide all that, then make a lizard collier from a flat round circle you can sculpt it to fit with the morph brush then tranz map then edges and add a scale texture to the lizard frill which will help hide the some issues with head replacement.