So you have recreated horse dick from scratch, replaced simple shade on legs with gradient and changed contour color.
Dick looks better, the original was ugly. Black contour seems a bit sharp contrast to light fill to me. I would prefer to make gradient for each leg rotated to align with leg shape and expected light source from above. Regarding fur, I have no better idea for drawing flat horse fur. Flat color, even shiny, seems right for that to me.
I haven't done much in last month. I can't devote as much time as in December for family reasons. I've done some math model for body movement and body segments intrusion (bump) on paper.
Taurika responded to my message that she doesn't want to get her picture animated. It is not in my custom to respect that but she was nice so far and new to the business so I'll make an exception. She may change her mind on that. I can use the same model for any other scene. The task for now is to find the replacement picture for animation. It has to be convertable to vector graphic, which means flat colors or simple gradients for body segments, definitely not textures. And it should be remotely similar to Crow's drawing style.
I've checked the weird "vaginal" Jaymee cowgirl scene in Official archive. It turned out to be just broken anal scene. That's why there is no pus*y and it looks like a belly job. It's just that her anus sprite stays in frame intended for pulled out position (obviously to be used in unfinished part of climax animation). I've created modified anus and butt shape for vaginal scene but such simple change doesn't work well in the part of animation where she twists her butt. I would need to create more sophisticated pus*y sprite pair in layer above and under dick to imitate twist on the dick.