Well, supposing this is going to be a children's game it is quite nice. But you should correct the UVs!
The wood texture's mapping is a bit off.
Kids normally don't have high standards in graphics - but with kids always starting earlier with the pc may cause that they notice these things as little bugs.

Another thing is: Don't just use plain color for a face! It's a) wasted texture space and b) somehow outdated.
Give structures to the blackboard and the red / blue parts.

Always wonder how it looks in everyday usage.
It is very hard to perfectly clean a blackboard, remains of chalk everywhere (remember, kids often touch everything [because they also learn through this "touching"]) would fit the model

Basically, without seeing a mesh it seems to be a solid model.
But try to improve it with the points mentioned above!