On Commons, I like to add the {{Artwork}} template (and its sub-templates) to paintings and develop their data records. I also like to categorize images and sometimes develop new categories and cross-references to other categories. I don't upload much, as I haven't the patience. I like working at Commons because even the smallest edit truly contributes something to creating an unparalleled reference depository for posterity. And no one complains or argues about it!
I am engaged in a long-term project to develop the data records for Sir Thomas Lawrence's paintings on Commons. For example, I have entered extensive details for File:Portrait of Catherine Gray, Lady Manners, by Thomas Lawrence.jpg, as well as edited the image itself to de-skew, crop, and adjust colors. But I am easily distracted sometimes and go off on tangents working on other ideas.