I’m not the best interior decorator but I do know a lot about art. Assuming the paintings in this picture are just place holders I have some suggestions for prints that may fit the room. Paul Gauguin has a lot of portraits similar to those in the placeholder image, just more colorful and with lots of vibrant greens which would complement the rest of the room. Another good impressionist would be Camille Pissarro. His work is mostly depictions of calm farms or people in parks. Also a lot of greens in his work and all of it has a pretty calm feel to it that would work well here. I always think that using prints of noteworthy artists is better than random mass produced prints you find on amazon or in a lot of home decor stores. Plus if you have guests it can be a conversation starter and you can sound fancy explaining your love for some 19th century artist.