How much should I charge for these?

I'm posting some of my old artworks on Reddit. I'm 17 now, and I drew the alligator in 2020, while the others were from 2021. It's been two years since I last worked on pieces like these because I've been busy studying.

I'm from Assam, and I used to take portrait commissions back then. But honestly, no one ever paid me more than $10 for them, which still makes me feel bad. Each portrait took more than a week to complete, and I always felt they should be worth at least $50. But when I see other artists' posts on Reddit, I feel like my alligator piece alone should be priced at $150(in my opinion for an unknown artist 🤡) .

The pirate ship is my favorite piece, and it took me more than a month to complete. I used a very thin sheet of paper because I couldn’t find good gsm paper that big(almost 1.5x2ft) at the time. Now, due to Assam’s humidity, the surface is no more flat, so I might not be able to sell the original. Also, have you noticed the yellow eye? 👀

I took the reference photos for the ship and the bird from Pixabay, which provides free-to-use images. Would selling these artworks be an issue since they were based on those photos?

Selling locally isn’t really an option here, so I might start selling online after my exams in March. I had an Instagram account but deleted it. Etsy is no longer available for new users in India, so I’m looking for better ways to find genuine international buyers who will appreciate the effort behind my work.

Artists, how much do you think these artworks should be worth? And what platforms should I consider for selling?