Step-1: Select two images that you want to mix together. I have chosen -
a)Sky Image.
b)Parachute Image.
Step-2: Use the pen tool for selection. Select one parachute carefully.
Step-3: Select the whole parachute image and then press Ctl + Enter to select the outline area. Now take a copy (Ctl+C).
Step-4: Paste your copied image into this sky image.
Step-5: [...]
