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Deselect nebula (Select > Deselect or Cmd/Ctrl + D) and begin to sculpting the shape. At this stage, I used two tools: Warp Tool (Ctrl/Cmd+ T or Edit > Transform > Warp) and Puppet Warp (Edit > Puppet Warp). To give the basic shape, I used a Warp Tool few times, gives shape to something similar on picture. You can experiment with all of the Transformation tools. Try to stretch the edge of the nebula, so they will look more interesting and realistic.
To make a more precise form, I used Puppet Warp few times to make the final desired shape. I place transformation pointâ€™s nebula around the edges and give the desired shape and a little spaced out some parts. Just be careful, because if you strongly to stretch or bend one point may get a nasty bend in the texture and it will need to be removed.