Life is simply missing in all visualizations, but here you can see this lack the most.
Very nice project. I like colors and light. I would fill the foreground of the visualization more.
I would add more children's characters and highlight them.
Very nice interior. I would add more objects to make the space look cozy and inhabited.
Nice image! Just a few ideas..:
1) I would maybe add one or two person to clearly show the scale
2) Lamps - Nice detail I would move them a little bit to the left because as of now the lamp creates a tangent with the corner of the building in the back (to read more about this just google
3) Framing - I would add a little bit more space to the bottom of the image (see my sketch included)