Looking back at what I had said first, I realize my question was a bit ridiculous. Of course, his/her colors are obvious: white, black, brown, bit of red/orange. I've seen many threads on here lately asking about guinea pig colors/coats..I think I'm more curious as to what breed he/she is, if that's even possible to identify. I was thinking abyssinian mix?
The guinea pig in the photo is a tri-colour (white, black and orange), the brown on the face is agouti (bottom of the hair shaft is back but the tip is orange making it appear brown), the colour on the back looks to be roan.
It looks to be an abyssinian, but it does look like it has less rosettes then the average abby so it could be an abby mix.