well, to be honest, 2-3 hours is quite much for this board - as well as 15 $ are far too much for this.

Just one question: Why do you post it here if you do not listen to users?
This thing needs to be really good to be worth 15$.

For example, look at this model: Chalkboard for 10 dollars

a) it is 5 dollars less than yours
b) it got the right mapping
c) it got nice textures
d) it got more details (just look at the screws and chalk)

Well, if you had listened to the above post, yours could look as this.
But just loading it up to turbosquid won't improve the model, neither your modeling skills.

~