The light in the picture is coming from the top of the picture from the sun in the sky
The positioning of the model is sitting down and she is leaning towards the side
The background/setting is outside
The Pov/distance of the photographer is close to Marilyn because she is taking up most of the picture
The lighting ,position, and expression communicate that Marilyn the model is happy, but she also looks like she is working based on the chair and what looks like a script in her hand