I am sure I did this the least efficient way, would it work better to use a layer mask? Of course I would have to know how to use layer masks. I can't remember where I got the night sky - just googled night sky photos.
I like your idea for this Judy and think it looks good as presented. Once you master layer masks you will find photo editing and compositing becomes so much easier. I have no doubt that you can master them once you make it a priority. Here's a simple tut that has gotten some favorable comments. I'm sure Sepiana could point you to some others if you are interested.
Canon 7D MarkII Lenses....24-105 (my newest and I love it), 10-24, 50mm, 70-300, 17-55 Sony a6000 Lenses...10-18, 18-55, 55-210, 35 NIK Suite OnOne Photo RAW 2018 Topaz: Adjust, Clarity, Simplify, Clean, Lens Effects, Remask, Impression, Star Effect, Restyle and DeNoise A.I. Gigapixel
The video in hmca's post talks about the 3 colours you can use on a layer mask - black, white and grey.
Actually, you can use any shade of grey. This is especially useful when you want to vary the strength of an effect on the layer the layer mask is attached to. Normally I would have the colour swatch panel open and selectively choose different shades of grey to paint over various parts of a layer mask where variation in the layer effect is required.
I also often use a black to white linear gradient on a layer mask. Typically, when adjusting a sky the transition between the sky and below the horizon can be a bit harsh. A black to white gradient on the layer mask from just below the horizon to just above it will produce a softer natural looking transition.
You can also do all sorts of amazing things with layer masks.
Judy Like the marriage of the stars and bubble. You nailed the bubble....large crystals...must have been cold. How many tries did it take or are you charmed? Been too warm here, but looks like cold within a few days and will give it a go if I am here. Thanks. Clive
Sony A7III FF mirrorless, Sony A77 APS-C Sony FE 24-105mm f/4 G OSS, 70-400G, 70-300G, Sony 16-80 CZ, Minolta 100 macro DJI Phantom 3 drone
Took MANY tries! It was about 5 below zero F. I would guess about a hundred tries. It was cold but bright sun and same for tomorrow so, I will try some more! Charmed, not at all. Might try my macro lens. Thanks for the kind words.