Hi,  thanks for mapping. 

The buildings you mapped are well done as to their location. But pay attention to the squareness of the corners. Always draw buildings as square and precise as you can. Then add the Building feature type. And last, right click it and click the square icon. 

The outline should be for the full size of the building even if it is partly covered by trees in the imagery. Take care to not include the building shadow in the building outline. After drawing the outline and tagging as a building, use the 'Q' key in the iD & JOSM editors to "square" the corners.

Please watch these 2 short video for more info: 
-Buildings--> https://www.youtube.com/watch?v=Xs5wX592E1o
-Roads--> https://www.youtube.com/watch?v=ZBLwb2nisJQ 

Thanks so much for your contribution, 

Martien, HOT validator.
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