there arent any real rules here for making luminox but i would like u to do these things:

make the luminox's "skin" black with max metallic
white eyes
if the luminox has a blue crystal make it metallic and shiny
limit the amount of parts on the luminox so it looks smooth
the luminox cannot touch light without a blue crystal
add weight to the luminox

and those are the things that u should prolly do but im not really gonna stop u from not doing them