Ilanthar, you have the beautiful mind of a true artist.

There is only one thing wrong with any of these, as far as I can see, and that is down to the natural space background, not you.

In the area of the solar system key, right in the top left hand corner of each of the maps, there is a dark blob in the background that is nearly as noticeable as the plan itself because it is as dark as the key diagrams are pale in comparison with the rest of the background in that area. I don't know if it would be possible to clone adjacent colours from the background over the top of it, but I think it would look much better if you could get rid of it.

As you can see - your work is so perfect that all I can do is pick on a tiny spot!