I'm nowadays selling prints of my artwork at Posterlounge.de
https://www.posterlounge.de/kuenstler/nadja-mikkilae/
The quality check for the site is very strict. That is very good, since this only means that you can expect very good quality for those prints!
I'm currently taking new photos of paintings and uploading them on the site in very high resolution. If there is a specific painting you'd like as a print, let me know :)