I think it has less to do with difficulty and more to do with the number of times the process would have to be repeated.
To put eyes on a sprite, you'd have to repeat the process eight times for every action a character would ever do, multiplied by the number of frames per action. And you'd have to do the same thing with every sprite or it would look out of place.
I realized that I went a little too far with wishing. I am just searching for a way, to see (little) more detailed sprites. The avatars should have faces. ((-(-_(o_(o_O(x_o)-_-)_o)_-)o)) Thanks.
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To put eyes on a sprite, you'd have to repeat the process eight times for every action a character would ever do, multiplied by the number of frames per action. And you'd have to do the same thing with every sprite or it would look out of place.
That's a lot of eyes.