One of my favorite artists gives some tips. Too bad he is no longer with us.
https://www.artsy.net/article/artsy-editorial-artist-jean-michel-basquiat?utm_medium=social&utm_source=facebook&utm_campaign=editorial&fbclid=IwAR2ofVQjzRbc0zmRbuGJ0P-qc3VUmoiHBDeY25s_Aujl3D1FhWd0mokwWRg