There are no hard and fast rules about what kind of pictures can or cannot be hung in the bedroom.
People usually prefer paintings that improve their mood.
If you want to feel peaceful in the morning, then pay attention to paintings in a pastel color palette.

At the same time, paintings with bright and vibrant colors will charge you with energy for the whole day.
Some people like real figures in paintings, other people prefer abstraction.
In general, choose calming and serene pieces of art for the bedroom, keeping in mind the color scheme of the room.
Nature scenes, abstract art or portraits work well.
Avoid pieces that are too bold or chaotic, as they may disturb the peace.
Please note that oil paints can be toxic.
Even if the surface of the painting is dry, some gas may be released from the paints for a long time.
Therefore, it is better not to hang oil paintings in the room where you sleep.