This is another pencil test I did a few years back for a video game company that was doing a 2D game. (Don't ask what happened to it, I don't know- it was called THE ACT at the time). Anyway, you have to imagine staggers in the two spots he is straining to open the window, I was going to add that when I tied it down, but never got to that, that I can remember. I don't think this was used because this section was cut for cost reasons.
You can find it here:[link]