Palette by Alpha6, Based on this photo of the Orion nebula https://i.imgur.com/VM4L34o.jpg
Edit: Rounded the top, added darker bits and AA
Thanks for the feedback and compliment! I'll try both of those things out and see how it looks.
I would just add a tiny bit more dark details to the tower to make it stand out a little bit more from the background. Maybe some darker lines amongst the purple ones would do it. And make the top of the tower a little bit rounder too.
Love the background clusters and composition though! Great job