I like the artwork, and if the guy's from Swansea he must be alright!

If I ever got something like that done, my main concern would be that they used appropriate hardwearing and long-lasting paints - with loads of clear coats over the top (in other words, that they know how to finish a
guitar properly, as well as just doing the artwork).
One thing I notice when you look at sites like this one - they tend to do paint jobs on relatively cheap guitars. Which I can understand, you wouldn't want to "risk" your £2,000 PRS - but on a cheapie the refinish probably costs as much as the guitar itself.