For my first cosplay I selected something that is easy and fast to make. All the pieces were first carved out of thicker (8 cm) insulation foam, thereafter sanded with sandpaper and colored at the end.
Before painting, the foam has to be coated with protective coating to eliminate damage to the foam done by used paint. I did this using two layers of the wood glue. Other thing can be used as well.
For the skull that represents guitar’s headstock I used ball made of Styrofoam. First it was carved out to fit the guitar handle and then painted it with white color. Details are painted in black.
Guitar strings are made of the rope painted in black.