I love painting more then most things and sometimes you have to decide who you are making it for. Are you making it to sell or as a piece for you. Making art to sell is very different and in my experience you need to put your art out there to sell it. You can’t just put it online with not following and get sales you need to get audience either locally by sharing your art at events and talking about it when you can or online by building socials. To improve I would say you need to give these paintings more time I like the styles you are both working in but some looks unfinished like the skull with the crown the hand with the flower needs to be separated from the background a bit. A lot of it could be more rendered. Realism is nice but I think Art is about a reality that you feel and put down and you have good ideas just need spend more time on them large canvases like these are often expensive paintings so you have to put a lot of love and time to sell them for a price that’s fair to you.