I looked through your art and I really love the feet studies you did! They look great :)
I noticed that with your faces, your style is heavily influenced by Anime. Anime is a stylized version of realistic anatomy, and often if you don't have a solid grasp on the realistic anatomy, you struggle drawing Anime style too.
I recommend that you try and focus on using our Face & Expressions tool to focus on the realistic anatomy first before you attempt to draw in any other styles. It will probably benefit you most!