At first many thanks for your interest in our dear project!
We have to consider that the pictures would be printed so the maximum res. the better. If a photo would be a full page print, the resolution needs to be higher. I guess a minimum of 2MP, I would say better 3.2MP. But I am not an expert on this issue.
I would request support from Jack who is an expert on this matter. He would add more info regarding the sizes.
Please check the site for updated info!.
Any questions will be welcome! Do not hesitate to check the project site and be in touch.