Soz if this question seems out of place, but does anyone know about a course, tutorial or anything about post processing?

These splashes made by Riot are done with an entire team and an art director and it can also take weeks to be finished, but i feel like the post processing and effects plays a big role on them, i can do painting or drawing just fine, but i feel like i could up my game by knowing these post processing and effects techniques.

I also think that a good knowledge about photography helps a ton. Anyway, this is about it, pretty much.

Some skins as examples.