So, I decided to add some shading to the sprites I'm using for my MOD. As much as I love the original NES game, the colors were very limited. I'm not doing anything crazy, it's just a simple cartoon-shading that makes the sprites look nicer and not as flat as before. So far, only Leonardo, Raphael, Bebop and Rocksteady are done. Here's a picture. Obviously, the ones on the top are the original NES sprites, the ones in the middle are the one I recolored and then the ones on the bottom are the ones with the cartoon shading. This is gonna take some time but it will definitely be worth it.
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