Here are a bunch. Each one is no more than 10 mins.
Dollar store oil pastel from China on the first two on Pentalic 70 lb sketchbook 5.5x8 inch and the rest are all Portfolio Watersoluable oil pastel on Fabriano Artist Journal.
Added Derivian Liquid pencil on the top.
My favorite though is this piece. I bought one of those old times eraser where one end is white rubber eraser and the other end is the abrasive grey colored end to erase ink which usually doesn't work but it worked superbly on this paper.
The eye highlights in white is Uniball white signo gel pen, the eyes were done with 9xxb General pencil.