Floblue, upload any size you
want. We all have different size screens so it doesn't matter in the least. Plus, if you use the size Yorky suggests, it will look fuzzy on many of them. Plus some of us can't see well so please don't make it too small!
From the forum guidelines.
Please note you do NOT have to make your images "actual size". I'm not sure where that rumor started. As long as the image is up-loadable by WetCanvas standards, please post your image at whatever size it is that you prefer.