It's not bad, but truth is the image suffers from what is called vignetting. Looking closer at the corners, they're darker than the rest of the image. This was due to issues in the optical train in front of the camera.
One day soon I plan or revisiting this star cluster which is just outside of our galaxy, to see if I can correct it. If not it'll still be fun to get away from this planet for a while anyway.☺
Could you tell us about your telescope and camera? It is a fantastic shot.