@Heather-Foxwood Wow, this new composition is GREAT! 
I love how you managed to put in a lot of children's stuff although you don't show much of the room!
I would put th mouse more to the left and deeper unter the bed, because it wouldn't be bad to show her in full, instead of cropping a part of the head.
Also it might be interesting, as the mouse is wearing a pyjama, to give an visual hint that she has her bed under the elephant's bed, instead of putting nothing under the bed.
It would be something in the shadows, so you would have to work with silhouettes that read well.
Or the mouse has her own lamp with dimm light, behind her. XD
About the colors: Are you only testing the hues which you want to work with, or are you going to color it in watercolor 1:1 this way?
Regarding the hues: In my opinion they work together much better than in your first attempt. The only thing I would change is the color of the mattress, as purple stands out and so something very unimportant becomes a focal point. Why not making it yellowish grey or greyish green? Some color that is already in a lot of places of the illustration, but greyed out so it's less important?
Also I think it would better fit the cushion to have a green tone, making it go together with the very cool leaf-blanket.
So the overall colors of the room would somehow resemble "jungle" - browns and greens - which I think is a very cool hint that (some) elephants live there.