Your design is awesome! The title 'the dragon-centaur' had me skeptical, but you've pulled it off really well. The costume work is especially spot on. I love seeing the way you've thought out the characters anatomy and jewelry and how they work.
My only critique is based on the last image you posted; her torso looks (imo) too straight / upright, and I think you could get a more dynamic pose out of her before pushing to the final.
Either way, it's a really cool character. Excellent work.