If you create an account at Image hosting, free photo sharing & video sharing at Photobucket
you can upload some =) it'll tell you how to do it there (its actually pretty easy)
And there is also a feature on The Horse Forum where you can upload pictures of your horses =) Look at the top of the forum. There is a green bar with the word "Horses" on it. Click that, then click "Your Barn" then select a horse's profile (i see you've already made 2!) and there will be an option to upload photos =)
I hope that helps!