This is generally a high quality contribution. There are some minor inaccuracies here and there, but on the whole it looks like you took care to accurately map the buildings here. 

You updated the river to match the imagery. Please consider the data that you upload in a changeset; editing the river resulted in the changeset bounding box being quite large compared to the building footprints. You also did not state that you edited the river in the changeset comment. You can see what you did in the left hand panel before uploading. https://wiki.openstreetmap.org/wiki/Changeset

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/