This is how to create a realistic bubble in photoshop.
- Create a new workspace with the following properties.
- Fill the canvas via Edit > Fill > 50% Grey
- Add a lense flare with the properties in the picture via Filter > Render > Lense Flare
- Add Polar to Rectangular Coordinates from Filter > Distort > Polar Coordinates
- Filp the canvas vertically. Image > Image Rotation > Flip Canvas Verticle
- Add rectangle to polar cordinates. Filter > Distort > Polar Coordinates
- This is what you should have so far
- Put in guides at the half way x and y and while holding Alt drag out the eliptical marquee tool from the center of the bubble to the edges so that all your bubble is selected.
- Press Ctrl + J to duplicated the selection.
- Delete the first layer and create a new background layer and fill with any colour you want.
Thats it, you can now duplicate the bubble layer, expand the canvas and create a flash bubble scene.