I like that you have added this capability to the forum, but I have a couple suggestions.

1. The only file type allowed for a larger size is for jpg. Some people use other formats such as png.
2. This will take a little programming, but you can add an image handler that will resize and compress images that are uploaded. There are php modules that do this. That or, Mechanic688 will have to get to work creating all new tutorials for editing images