A bit more scattering then bunching of stars (whatever star brushes you have, select them to rotate, size vary and scatter on the brush options) gives it some more interest, also galaxy patches help (a patchy soft brush with overlay filters) add that extra bit of texture. Last, a gradient overlay or even just a hint of it to the sky itself to give extra depth and easy sky, yeah.
((Omgosh! Dawn! That looks sooooo much nicer!! Ah! It’s so much more pretty! I love it! Thank you for the tips and demonstration! ♡))