@mag with the light, definitely. In fact, my personal opinion is that there should be more light.
Hope you don't mind, I did a quick draw over, knocking back the value of the stars surrounding the two main characters. I also lightened the elf's pants because her bottom half was disappearing into the background. Finally, I tried to darken the clouds -- for me, the scribbly detail on the clouds was distracting the eye and making the piece appear busier than it was. The scribbly detail is adorable, but you may want to try a version without (hopefully it's on a separate layer!) and see if that helps the composition.
See what you think ... of course, this is only one way to approach the values and composition. Looking forward to seeing this in Critique Arena!
698e3ea9-599c-4c95-a96b-7bfe50fb328c-mt-star-drawover.jpg
41fdc66e-ac96-4404-a582-e662dfbc9cdf-mt adjusted value.jpg
P.S. -- one more nitpicky thing: is the star drinking the tea/coffee too distracting? Would it be more effective to take away the mug and have the star look at the two main figures? Or if you want to keep the mug, none of the other stars have arms -- what if its arms were its two side points? Just another thought to think about!