I adore it. it's simple and very nice. the char is wonderful, I'd work on it's qaulity maybe vectoring though. Perhaps a border to make it stand out mroe from he bg could be added but I don't want to deteriorate the simplistic bg you did, and that after you worked on it a bit, maybe a filter after cleaning. It's very refreshng, a wall like yours. Work on the bg, another color that stand out more form the char perhaps, and some border with floewer brushes or grundge could work too.
Good luck!