If you host them on an online photo account like photobucket the size limit doesn\'t apply ( I think ) so I just do that.
The width is the only one I worry about.
Nigel
The other thing that is useful if you use something like photobucket is that its possible to change the photos of your minis for better ones if get a new camera etc without posting it as a new submission. Just delete the original photos in photobucket. Then upload your new one and make sure you name it exactly the same. Hey presto coolminiornot is now using your new photo. It only refers to the file location on photobucket, so aslong as the name is identical it will change the pic.
Nigel