Okay, here's Celtic Guy #1 from Gill's prompt exactly as written.

No style applied. Looks like SDXL thinks it's supposed to be some kind of decorative figure/ornament. Not bad, but could be better, so I reworded it a wee bit. That did the trick, now I am spoiled for choice and I have not gone anywhere near the blond dude yet. 

Slightly altered prompt: a man with long dark hair in celtic dress with sterling silver highlights and digital art style applied makes for pretty good heroic/bardic type character.

And one more with ClipDrop's Fantasy Art style applied. Have to be careful with that one, seems it can't decide if he's meant to be a mage or a deity. Royalty at the very least. So if your friend likes any of these, Gill, please do feel free to pass them along. I've plenty more left to play with.  :-)