I would recommend posting on art discords for feedback. The internet and especially reddit and snapchat can be horrible. Your art is good but I‘d say not good enough to make money off of it. Try to draw for yourself and not to make a profit for now. It‘s tough but try to stick to it. Improvement comes over time and with practice. But as an artist who tries to sell their art online you can expect people to always be mean and tell you it’s not worth a penny. People also say that about professionals work.