So, did a little more sketching today, I put the results in scraps, and wouldn't mind some commentary:

http://www.furaffinity.net/view/7127361/

I love how the face and head came out, almost perfect. I'm pretty sure the body is too big for the head, and the breasts - while they're supposed to be fairly large (this unicorn is based off a draft mare) - just look... kinda wrong.

Ah well, tomorrow, I'll try again. Maybe leave the head off and try to do the body instead.

P.S. Bonus points to anyone getting the 'Coupling' reference.