Hello. Thanks for mapping.
A few remarks.
Don't include the shadow of a building.
Don't oversize the round buildings.
I measured your mapping on this location
https://www.openstreetmap.org/node/13334108533/history
which has a diameter of 16 mtr .
The actual diameter is about 8 mtr.
Check it on Google earth on this location if you want.
9.99784045 -5.298588949999999

Best regards 
