Hi, all but one footprint you mapped represent a building; I think the round building represents a tree.

Generally the footpritns here are accurate and it looks like you took care when mapping them, please try to exclude the shadow a building casts from its footprint size. Mapping the footprint slightly smaller than pitched roofs you see in imagery can help with this, and accounts for the likely overhang of the roof. 

On a few occasions it looks like you mapped only one half of a pitched roof i.e. only the dark or light side. Consider the roof shape, how the scene is lit and the shadow a building casts (e.g. its length) to aid your interpretation. https://wiki.openstreetmap.org/wiki/Key:roof:shape#Roof_shape 

I flagged the footpritns for reference in OSMCha.

Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/