No problem, thanks for the photo!
I've changed the building to Plaid in https://www.openstreetmap.org/changeset/126162840.

In StreetComplete you may see quests that say "Can you contribute anything to this note?" (although you may need to turn on the "Show all notes" setting to see this note, since it's not phrased as a question).
For these quests you can usually reply with an image and text.
Otherwise, you can long press a point and click "Create new note" and add a photo that way.
All it does is add a note with a hyperlink to the image, so if you're comfortable adding imgur links that works just as well.

Thanks!