Well done! You identified buildings in the imagery and I don't think that you outlined anything other than a buiilding. The buildings' footprints however, are not accurate. The low resolution imagery does not help, but you need to interpret the imagery and give buildings realistic shapes rather than tracing distorted imagery or artefacts. I recommend that you find a task area where Mapbox imagery shows on the whole the same buildings, because it has a greater resolution in this area. This will allow you to compare what the same buildings look like with different levels of resolution. When you must work with low resolution imagery zoom out first to ascertain the shape and orientation of buildings, then zoom in to digitize them accurately (you can repeat this of course if you forget the shape for example). Quality > Quantity.

Thank you for your contribution.
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