It appears as though you have the shading/highlighting down well enough, but I think you need to work on your definition. Blacklining definitly helps with these mini's, otherise all the metallic tends to blend into everything and your mini ends up looking like a big chunk of almagamated appliances. A better photo couldn't hurt either ... the white background doesn't really help in viewing the mini any. Try a green one - not as bright, and since you dont have any green in the mini it wont blend into the mini itself. Black is a background I have used before, and to good effect.