Hi I see in the biography where it says there is a picture attached, but the person who made that profile, and presumably wrote the biography has left it unmanaged.
So you're Great Granddaughter? Would you like to take care of and improve his Memorial as well as add yours and his connection into the world family tree? Looks like you've already got a great head start put together for you. There are people who's job it is to help you learn how...and it's not my job, but I'll help when I can. (as will many others) Oh did I mention it's completely FREE!?!
Seriously though, it looks like the person who created the profile is no longer active, but his profile is under WikiTree Admin control. I would think you'd probably have to be a member first, but they may be able to help you find out more about that photo...at the very least the profile creators name. He may be a cousin you know?
Anyway we'd love to have you if you're interested.