Pricing canvas artwork

Im new to selling my art. I believe $40 is a solid price for a 10x8 canvas. Being 100% honest, how much should my art be?

https://www.ebay.com/itm/405487858866?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=fctxo-7frty&sssrc=4429486&ssuid=fctxo-7frty&var=&widget_ver=artemis&media=COPY

https://www.ebay.com/itm/405473859973?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=fctxo-7frty&sssrc=4429486&ssuid=fctxo-7frty&var=&widget_ver=artemis&media=COPY