Photoshop commissions

I was asked to come up with a logo for a health spa type place. It's called Nuada after a mythological Celtic warrior who acquired a silver arm to replace the one he lost in battle against the Firbolg (long story, won't go into it here...)
Anyway, I came up with the sketch here and then mucked around with it in Photoshop using my newly acquired photoshoppy savvy, such as it is. Whaddaya think? Any feedback is welcome.