Munch’s comment regarding the painting is as open to interpretation as is the painting itself. The statement that “I sensed a great, infinite scream pass through nature” says nothing about what he painted in order to capture that feeling.
Munch was trying to caputre a *feeling * via a painting. The painting depicts a figure on a bridge, hands to the side of his face, and an open mouth. It is true that there is no little cartoon bubble going “yeowwwww” so we can’t be sure what sound the figure is making. I suppose he could be yawning, but since the title is “The Scream” it’s safe to assume that that is what is he is doing.
A “figure screaming” is in fact what the picture depicts. What that depiction means is something else altogether.