I just want to say thank you so much for all of these replies! It's really helped me see that its something I can always come back to. There are some great thoughts and I really appreciate that there is a forum where I can get this kind of help.
I was stuck in a place where I felt as if I couldn't progress unless I'd really focuses on realistic face, but after these comments and the information in 'How To Discover Your Style', I think I can finally move on and try something new.
Design, tone, and an underlying understanding of composition really sounds like parts of the puzzle when it comes to putting together an illustration. By studying these and trying out different subjects, this should hopefully bring me back in full circle where I understand realism a lot better, and I can apply my new found skills to create something great.
Thank you all again! Time to work on discovering my style before Inktober!