you have some good ideas coming along but if you really want to improve you should try practicing your anatomy, for this art try studying some octopus to sea how a tentacle should look like as well as people to figure out how to draw the features right. Once you understand what you are drawing or painting you should have an easier time creating a composition or coloring it. It won't be easy but it will help in the long run. Hope this helps sorry for the long comment.