posca_usa x secretwalls BITE SIZE TUTORIAL “DOODLE MASHUP” POSCA Uni-Versity Artist instructor upendo_ uses this fun improvisational doodle prompt to get the inspiration flowing 🖊️ Grab some Posca markers and try this at home ✨ #secretwalls #posca #poscausa #poscauniversity #uniusa #tutorial #artist #art #drawing #doodle #blackandwhiteart #improv #illustration #drawing