Image icons for garrys mod downloads not resoluting.

yes, usually i make all the guides to help others, but this time, i need the help. I’ve uploaded some files with some decent images (big enough to fill the screen correctly), but once i updated the file, the images are all too small and spaced apart to be read legibly. can anyone help me out on this? if it has something to do with size, i can surely fix that, but i just want to clarify.