Welcome to Cubebrush!
I don't really have much to add that hasn't been said already, but as far as illustration goes, you probably want to work on your storytelling and your ability to tell a story from a picture through your characters and their actions and also the environment that they're in.
I personally like illustrations a lot (even if I'm not that great at it), because it allows you to touch at almost everything in a single piece. By that I mean character design, environments, props, colors, light, perspective and all that good stuff. It can certainly be difficult, but to me it's so fun and rewarding. And looking at what you do, I'm sure you won't have much problems getting the hang of it.