@Heather-Foxwood
I could not explain in words how I would change colors, so I took your illustration into Procreate and changed around a bit.
What I did:
Moved mouse and book to the left, changed the wrinkles at the end of the bed (they look so moving/dynamic in your version that it distracted my eye).
Then I desaturated big parts of the picture: the blanket, the bag, the part of the floor that is in shadow, the wood of the nighstand.
As all the high saturated colors were battling for attention of my eyes.
Then I changed the color of the cushion to a color that doesn't make it a focal point and doesn't merge with the elephant's colors. For me the pink was too close to the inside of the ears and the pyjama.
I realized that the color of the pyjama of the mouse is too close to the color of the floor to make her a focal point so I changed it to something very bright (just an exaggeration to see where it leads).
Then I added a grayscale layer to see where to add contrast value and added light. (the greyscale is set to off for this screenshot, of course)
I messed it totally up under the bed, it didn't work out the way I think it SHOULD look, I'm sorry. Could not fix it.
Then I added a blue layer to change the shadows to a more blueish tone. As I work in procreate I first filled a whole layer with blue, then changed the mode of the layer to "Color" and the Opacity to 45%, then I masked the layer and erased (on the mask) every area that is lit by the light on the nightstand.
Then I realized that the shadows of the wood of the end of the bed didn't have enough contrast to the shadows of the blanket and darkened them. I also darkened the wood that meets with the elephant's body, as this helps the elephant to stand out more.
I erased the shadow of the body at the wall, as this shadow might be there in reality, but in the illustration it blurries the edge between elephant and wall and hinders reading the silhouette well.
Then I realized that the face of the sloth makes a focal point with it's high contrast between white and black and make the white face grey.
I think that's it.
If there is anything helpful for you, I can also give you the procreate-file (if you want to copy the blueish layer to understand how to work with something like that).