Forest scenes can create very different moods. A pale clearing, a dense undergrowth, or large graphic tree trunks are chosen for a bedroom in very different ways.
Define the desired atmosphere
For a subtle presence, compare landscapes with moderate contrasts and soft contours. For a more enveloping effect, look at denser foliage. These are compositional ideas, not rules about what a bedroom should be.
View the decor from two distances
From the door, check the overall balance. From the pillow or armchair, look at the details that will be close to you. An appealing image on screen should also please you when a trunk or branch occupies a large area of the wall.
Coordinate the bedding
First, try solid-colored bedding to let the landscape express itself. A blue-grey, ecru, or terracotta sheet can pick up a secondary shade without copying the entire pattern. Keep the fabric and paint references with your project to compare the samples in the same light.