Excuse the quality of this one, the photo didn't show the outline very well so I put some effect on it.
Tail, mane, head and some details added. Taken on my iPod so the quality isn't that great.
Chest and neck filled in. Again, taken on my iPod.
"Nelly" finished. Rump was incredibly hard to shade, as well as the back legs. Had a hard time 'lifting' them off the page. Taken on iPod again.
And lastly, the end result. Not too happy with the photo, taken under artificial lighting.
Critique is welcome