Hahaha, I was talking about the transition area that relates more to the human part. I saw so many examples (mainly photo-manipulations) where the human part was blindly stacked on top of the horse. So trying to avoid this mistake and give this transition anatomical foundation yet pleasant to watch. Originally I was thinking about rudimentary human pelvis (only sacrum and ilium) but now I’m thinking about making it cartilaginous and floating. Similar to the absent clavicle in horses - they have brachiocephalicus muscle with tendineus/cartilaginous part in the middle that functions almost like a collar bone.
Yeah, with every iteration I’m moving towards more thinner horse. Actually, I did just a horse sculpt first but later realize that its body is too bulky. So looking towards arabian breeds now - they are really elegant.
Probably I should polish it a bit more and show the entire sculpt so it would be easier to judge about proportions.
PS Basically there are two types of proportions: when human and animal parts are relatively proportional and when the horse part is scaled down. Both have their pluses and minuses but I prefer more the first option. Here is an interesting diagram about proportions. I found it quite appealing since here the horse part doesn’t look ridiculously small as I often see http://www.deviantart.com/art/Centaur-Anatomy-101-Proportions-321617310