As you said you'd like a challenge; try and do me a female version of Omega Red. XD
I leave it to you to pick one.
Reference (image(s)): Click
Also, this is a basic idea what I want, save in doll form: Click
Up to you. The caption for the dA tho seems fitting. XD
Other/Changes from reference image:
Try and put your own spin on the doll, rather than just using the second image as an exact reference. As in, have the costume as close to the original as possible, but with a female slant. No shades, either. I have faith in you. XD If you need any help at all, PM me. Oh, and the tentacles are metal, not organic.