if i am honest it looks like you have the skills to it work without hiring someone you can see it in the art work, and to answer the 1st question do it in a pole and if people like it like that then keep it the way it is if not change it just enough so people can see a change and keep them coming back for more, i tell you what would work and I've seen it with your art style is maybe keep people in a 3d high end and the background as a lower end or the other way around, and how knows I'm not writing it off just because i don't like it your already bookmarked so i can track the changes if they happen if not just keep doing what ever makes you happy and lest you express your self in your art, but the main thing i would say is be open to change