Ok I don't want this to sound like an advert but I'd like to share my experience creating my first iPad app that essentially sells my pictures.
I had been to Kenya in Dec 2009 and taken some great shots, I originally did some photo books for family and friends who really liked the book. Now I know this doesn't make me a pro but I had the idea to make them into an iPad app late last year.
The app itself was quite easy to create. I code for a living. I thought the best option would be to use a flip book style where the user swipes the page to move from one image to the next.
The only clever bit was using the existing EXIF data and fields to add more info to each photo, things like geo location and descriptions so I didn't have to put in a database.
So down to the nitty gritty .... sales. Well not huge but the project was more about could it be done rather than making a million. So far 13 sold in 3 days.
My big concern was pricing too low, I went in at $5.99 which although I still think is low is quite high for app store pricing. I also think putting it in the books section might have been a mistake. I am doing no marketing so this is really a see how it goes app.
That's my experience, if you have any questions feel free to ask and I do have about 20 free codes if anybody wants a copy, just pm me.