Now you may be asking yourself whats mat_picmip?
Mat_picmip was one of the most well known visual "gains" possible in tf2. Mat_picmip changed the compression of the textures used in game. The command still exists in the game but its now locked to certain values so one can no longer make the texture quality as good as it could be.
If you want to know more about mat_picmip then I suggest the tf2 wiki.
I will continue to update this mod and add higher quality textures.
Some screenshots for the before and after pictures were provided by the TF2 Wiki and video provided by Fibonacci Sequence.
Warning: If you have issues with some textures looking lower quality before turning high quality then I advise you to set the command "mat_mipmaptextures" to 0. This should fix such an issue. This command apparently messes with fading sprays though normal sprays should work completely fine.