I dig the composition on this one. Posing is great for all characters, and I like the details such as the clothing folds and the rain effect. A few things though.
-Character on the left has a pretty ambiguous pose due to the camera placement. I suggest rotating the camera to the left and showing their legs as for this is present in the other two characters. It’s a very simple fix and would contribute to a better composition.
-The sky has very high contrast; the blacks and whites are very separate from each other. I know that the piece itself has pretty high contrast, which I believe is your intent, which isn’t necessarily bad; however I would like to imagine the contrasts as percents: let’s say that there is a scale of 1-100, with 1 being basic contrast, and 100 being highest contrast, and two factors to take into account: the character + ground render, and the sky background. I’d say that the character and ground render would be around a 50%; a good balance of contrast, but then the sky would be a 75%, which separates itself more from the character renders than it blends, which would look better in my opinion.
Other than that, you did a great job with the lighting, posing, and just general layout on this render.