Erim

1 more very important tip! I advise you take pictures of the celestial body after making it and adding it into the system rather than uploading all celestial bodies, why? Should you not do this, there is a chance that something happens to your device and you lose all our celestial bodies and hard work, and im talking from experience, I once had a large system of 50+ Celestial bodies and my phone broke and I lost it all, so upload celestial bodies after production as the website will have it saved there and you can redownload it (or if you are on mobile, ask a pc friend to put it in a system and send you the link for download just for the planet), if you have celestial bodies you dont want the public to know about, upload those as "unlisted"

Just 2 suggestions: Lore and more pics.
Lore: Lore, be it complex or just short simple and sweet, it just adds that nice element to worlds, it gives story and personality, maybe you could even have your own fictional universe with lore (Who knows? the possibilities are far and wide!)

Pictures: Celestial bodies have lots of beauty, and we want to do that beauty justice, correct? More pictures do help with that! (we are limited by 6, yet in the description you can add more, if you are curious as to how I could send you the link to a website that can help you with that). Tip: The best photos are photo's taken in the star system of the celestial body. Normally I would do this by making launch sites in space (id pick a place with a nice view) and add the celestial body into the system after its made, launch a dope craft, get in orbit, take pics and boom! This does take long but the best part is that you can see the beauty...be there, in a nice craft! The other good part about in system photography? If your celestial body is a moon, you can capture pics of the parent planet and neighbouring moons! If your celestial body has moons, you can get them in too, both? Well you can capture the parent and the moonmoons and neighbouring moons, thats quite a lot, yet, without overcrowding, it will look beautiful!