Please be more careful with tracing the outlines of the buildings. Zoom in as close as possible to see the outline of the buildings, hit each corner of the building carefully. Look for shadows, open ground, changes in roof color and vegetation to differentiate buildings. Your editors' Background settings provides the opportunity to change the Brightness, Contrast etc of the imagery. This can help to see buildings etc. more clearly.

Check out these articles with basic information on how to map buildings: 
- https://learnosm.org/en/hot-tips/tracing-rectangular-buildings/
- https://docs.google.com/document/d/1Swwz-ZwM3_YOstqstsmCg1-lNAPbnMLpi1Al-h-2UOQ/edit

Thanks so much for your contribution, Martien, HOT validator.
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