I have been on wikibreak for some months, but today creating a new article. I tried uploading a photograph from a US government source, using the "Upload from a government source" on Commons. I totally missed the license selector, which is hidden beneath the edit tool buttons box. Commons wouldn't let me upload without choosing a license, so I got a warning and then searched for ~15 seconds before I found it.
Of course I know a license needs to be selected, but I thought perhaps it was auto-selected as public domain, being that I was on the government source upload form and that I did specify the source in the "Original source" field.
Since the license selector is required and much of the other stuff is optional, the license selector needs to be at the top of the form, just beneath the Destination filename field.
For the "Original source" field, this needs to be a multiline text field by default, if the intention is for the user to "Give as much information as you can". No one should ever need to click the "more lines" button to the right of the field to get additional space. The additional space should just be there.
I know usability of Wikimedia Commons is being addressed. It would be good to get the upload form fixed sooner than later, and hope my feedback is useful. If someone with my level of wiki experience is failing at doing uploads, newbies would be totally lost.
-Aude