1. open picsart and go to edit.
2. choose the photo you want and then continue.
3. Then add the colors you wish to use. (make sure you have a picture of the color).
4. click on one of the colors and then go to shape.
5. choose whatever shape and make sure the border is on zero.
6. once you have done that, click on your newly shaped photo and choose either multiply or darker. (they look the best).
7. keep repeating step 3, 4, 5 and 6 until your picture is totally covered.
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I know that this is bad but i was kind of in a rush when making it.
Put hopefully some better tutorials will appear in the future.