Well you should find a better artist to clean up the lines and balance out the proportions of the wings a bit better. That alone will improve it quite a bit. As far as adding more to it that depends on what you like. Since it’s a swallow you could stick with the nautical theme, things like anchors and roses, or do something as simple as placing a ribon below it with a small bit of script. Or if you wanted something bigger you could cover it with a larger colorful swallow. Just pick your next artist a bit more carefully. There are a lot of talented artists out there who can do beautiful tattoos that you wouldn’t believe. Find one of them and you’ll be much happier with the work you have done in the future.