Hi @emmawalt.
The metaphorical sense of your collage is manifested at first sight. Congratulations!
The central location of the children preparing a recipe is well chosen. I like it.
The chromatic harmony of pastel colours that you gave to the scene seemed very assertive to me, and very appropriate for a children's theme.
I think that conceptually so far everything has been said, the rest becomes superfluous.
In my opinion, you should take a little more time to think about how to achieve better aesthetic unity in the composition. I don't say that this one of yours is bad, I am saying that you could get better results if you pay more attention to the composition to define what is important, what is necessary, and what is unnecessary, and think about whether certain elements are a contribution to the work or not.
Time to grow artistically.

Good job!!