Hey, I'm timsdad ! I'm a frequent contributor to the English Wikipedia and you can find my user page here.
Photos I've uploaded on the Commons
Diagrams I've made
Made on Microsoft Paint, these diagrams feature tall buildings for comparison with each other
Some of the images I've uploaded on Wikipedia
I used to upload images straight onto Wikipedia. I've since learned that it's much easier to upload everything onto the commons, and then it can be used in any Wikimedia project. However, free use images such as the one at the bottom aren't allowed on the commons, but Wikipedia does allow them if the correct rationale is supplied.