Light or dark backdrop, your choice but the sharp line in the back isn't doing your model justice .

What I meant by HDRI domes not "cutting it" is that often you get ambiguous lighting and undefined shadows if its the sole source of light (unless you use really expensive settings). Their strong points are environment reflections and ambient/fill light. That's just my opinion of course :3

Edited for the weird red smiley and later again for spelling lol :s