I haven't come across any photos of Albert Power myself. I used to be a volunteer at the Pea Ridge battlefield park which is where the action occurred for which he was awarded the MOH. They only have the barest information on him at the park. Unfortunately, his story gets overlooked. I'd be really interested in seeing anything you can find on him. I'll check over on the Arkansas board and see if anyone has anything.
Good luck,
Steve Burt