Hey, you can actually see some process vids on youtube of some splash arts. They stoppes making them but there are still used once on their channel too. I think they have more detail and more depth, they are also rendered to the extreme, where they seem lifelike. I think you lack some anatomy and shading, you're doing great, so just keep going! Maybe do some value studies and rendering. And as I said, there are process vids on youtube! Also on Artstation you can find a bunch of artists that work for Riot, a lot of times they are on the front page and give a ton of insights on their process! The recent Evelynn one was on there too.
here's one from diana, it was done by Kienan Lafferty, search him on yt too, he makes very good art vids that are very in depth about art, so maybe you can learn something there too ^-^
