Final edit:

My apologies for harassing you all further, but I thought some of you might like to know that I have posted the final version of this. This does not mean that this particular design has been finalized, and I'm sure there will be future developments. Thank you for your comments and tolerance, you've all been very kind.
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EDIT:

Another upload of my progress, for those of you who may be interested. Granted, there is much more to revise still (size of wing muscles, finishing wing feathers, making the mouth bigger still, but a lot has gone on here.

Can't spot the differences? Here:
1. crest feathers are now similar to a cockatoo's in their alignment
2.wing feathers are sleeker/harder and more suited to a wing (many thanks to ~feral-fowl for pointing this out to me! )
3. head has been shrank some, the eye has been enlarged (as much as the disintegrating paper will let me, anyway... )
4. Side has been altered so that he is in better perspective this time around! Thank goodness!
5. I've added some to his tail
6. His fetlock feathers are thinner and less stiff.

And etc, etc. I had better stop rambling. Really, I'm boring you to tears! I'll update this again when it is finished. Then I'll move on to another, I'm sure.

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Okay, so I thought I would do more technical tweaking on the design of my pegasus... mostly on the subject of the two scapulae, both equine and avian. I know that this is only a surface study, but believe me when I say that a lot of thought went into this, and what lies beneath. Yes, it's hard. And I am driven to create something that at least feels more plausible.

Some information that I have already considered in the design of this:
They are mostly carnivorous- less body weight is devoted to the digestive organs/tracts, therefor making the body lighter. The pegasus have appropriate teeth, and the jaw opens wider (trust me on this, please). Also, you will notice a third "toe" on each hoof, equipped with a spur like horn. Like a raptor's talon, if you will.
The large flight muscles attach to the keel-like breastbone. You can see them running along the ribs. That is where they are... and some of the lighter ones attaching over the equine scapula and to the collar bone (right?) This bit is still being worked out. I need better anatomical resources, for sure.
The tail: like a bird's. The tail bone is avian, made sturdy to help lift the rear quarters of the pegasus.
The wings: not only are they incredibly large, but there is a feathered expanse of membrane connecting to the hip to provide additional lift. Also, the wings are attached just behind the equine scapula, closer to the center of balance, no?

Feathered mane/crest is making his head look bigger than it is, if you find that to be bothering you. Also, he's turning his head slightly to look at us. I know, I'm ruining this with my comments.

Large sketch is still in progress... 14x17 sketchbook is still TOO DAMN SMALL. There, I said it. I'm too afraid to do sketches on nicer (and larger) paper, so I'm confined to sketchbooks.

Questions, comments, critiques, and other feedback is welcome and appreciated. So let me know your thoughts, good people!
This design is, to my knowledge, copyright to myself, April Schumacher. So there.

I know, I know... TEXT WALL!