Whatever you're doing to make the pony brighter isn't exactly working. For me, it's hard to look at. How about singling out only the main body colour from the vector, increasing it's light value , blurring it and then putting it over the pony?
Seriously? You've never heard of Dark Side of the Moon? You know, by Pink Floyd? The one below this text? Look it up. I'm sure it's on Youtube somewhere, but failing that, here's a link of a few Pink Floyd albums that I conveniently had uploaded to Dropbox. [link]