Had to try this too. I had a horse when I was young and I drew her all the time. This is from memory.
The muzzle area is too big and the jaw too square and short but no deleting, right?
And just for grins I did this with my tablet and piece of paper taped to it. Really works pretty good but I have to rest my hand on the tablet. I can't hold it up like Handrawn suggests.
Here's the image...
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