new assignment

In my Tuesday class, we tried something new, at least new for me. We each brought in a painting that was not working for us, then exchanged it with someone else in the group. We had to then take home the new painting & work on it. For me this is a really tough assignment, to work on someone else's piece, to put in my own mark without eliminating the other person's.

Here is the image I was given. The problem is I like this just the way it is, how do I work on it without changing what the artist intended? This may take awhile.