Your 3rd set shows improvement and could use a bit of improvement.
Unavailable would look much better with a smaller fuller and less hand drawn red "X".
The satellites could use cropping and sould be slightly larger if cropped to remove those nasty white outlines.
Spiral galaxy has to go. Find another image as this one drags down the whole set and makes it appear much less professional in quality.
The rockets are a delight and I like what you have done with the animations.
Your tags don't need to list every color contained in the set, 'multicolored' is sufficient.
nice!