Nice one! I've seen this model painted several times and I think this is the best choice of colours by far. The purple is very well done and I like the the grey flesh tones too. The claws are very convincing (WOW!) but the horns just aren't doing it for me. I disagree on the silvers - I think the metals are done. If you went too bright there, I think it might spoil the subdued feel of the fig in general. 7.5 seems about right. 8 if you fixed the horns. Good stuff!
The photos not too bad and it shows your paint job well (Very nice btw). Try using 3 light sources and if your camera has a manual white balance use it before you take the pic. I love this mini Im just not sure how he's going to use that ax without cutting of his own hands