Oh man I've been there with every one of my tattoos. Only one of them I'm still (five years later) really meh about. I get serious buyer's remorse with everything so I knew to expect this. I say, before you make any changes or additions, live with it for awhile. This isn't the same as a poorly done tattoo. Yours looks great. That doesn't mean you shouldn't want to change it, but at least live with it a bit and see how you feel. I love the idea of adding birds and some leave, etc to fill it in. I think that would look amazing.