I think the PrtSc, Scroll, Pause keys should be mod colored (black). Not only will it look better on ≥TKLs imo, but it will also enable you to use those keys (most notably PrtSc) on smaller layouts (65%, 75%, even 1800), whereas you can't really do that if they're alpha colored.
Also, consider using Print, Scroll legends instead of PrtSc, Scroll↲Lock, they look better.