I saw 10 faces (even on the spoiler one, which tbh doesn't actually look much difference cept for a few faint red lines), and 5 horses.
I did see another 2 faces, but decided they weren't really there as I was only picking up a few details rather than a whole face.
As for the horses, there can't be 7 for the simple reasoning there aren't enough legs.
Atleast not that I could see; this said, I have problems with stuff like this on the simple basis that they always use extremely light or extremely dark colours (often red or green with yellow or white) and quite frankly I can't see those colours so close together without
really concentrating for long periods of time.
I call colourblindist on all of the damn things
Also what in the hell is a "very observer"? Shouldn't it be "very observant"?