As an artist who barely gets notes/favs its hard to know when anyone likes anything I do so yeah positive, negative, short, or long leave a comment if you want. These are messy I know but I feel like I'm making progress.
Do you ever try drawing your figures and portraits doing actions or something more dynamic? I think that's here you probably stand to improve the most. When your art is engaging, it invites people to interact. So, more comments and such.