I've been trying to picture what these characters look like based only on the visual cues we get from the stories. Gareth Gallowglass has been a tough cookie to crack. I have to get Dumbledore out my head, because the way he's described looks NOTHING like Dumbledore. I know Dan has posted some alternative takes, which are similar to the ones I made up in my own head, but I went back to the original source material to figure out what he might really look like.

Gareth Gallowglass is in his late 40s, he's got a scarred face (no beard), his left eye is missing (no eyepatch). He wears the very same brown suit he was given as a gift back in 1951 (no wizard robe). He is a very serious, intense individual who probably sees far more than the visual spectrum. As someone known only for using his mind, he would likely have a lean body type rather than a muscular heroic body. So, given all that, here is my first serious attempt using AI. I'm not completely happy with the result, since I think as a comic-book character he should really be depicted as he would have been had he been in a DC Comic back in the 1980s, but it's a good start.