The picture's not very clear 'coz it's a bit too small for my eyes. I can see 3 horses. The ones cool_78 mentioned and the one on the clouds. I'm not sure if the purple flowers on the right side is an inverted horse though.. but it looks like a cow
4. 1) Obvious one thats walking around. 2) In the waves to the right hand side. 3) In the rock on the left. 4) In the clouds.
I see 4. One clearly visible, one in the water, one in the clouds, and one to the left of the picture meshed into the greenery forest or something.