I've tried responding to your drawthread in detail around 8-10 times now. I keep getting 503'd, and after all that, it takes me a while to get the gusto to try again.
The short version is porn. Learn figure drawing through porn.
Intriguing. A question I have to ask, from seeing other ponies in corsets - a phrase which completes my daily list of 'really? I said that out loud?' - why does she have a bust?
Very well done though. Not user about the color choice though. It works! But I wouldn't have expected it to. I must work on this whole color theory thing at some point.
Pants/feet troubles generally occur when you build a head and torso, and hang everything else from them. The legs seem useless and muppet-y when that happens. The only suggestion I have are broad guidelines - make a circle so you know the rough head position, then use one or two lines to map the flow of the image. But I struggle with this very thing, so...
The second thing, is gradient use. It has to be done real subtly, and often in concert with cell shading (or whatever it's called adding blocks of different color to stuff). A shortcut is to add a top "shade" layer, that's black and has graduated transparency, or graduated white in cases like this where it's dark and you need things lighter closer to the light source.
They do look different head on. It becomes easier when you realize they don't have equine skulls. They have humanoid skulls with equine bodies. They're an anthropomorphic dream - or nightmare.