Tumblr photo upload

This really only makes sense if you look at the attachment - but here's the story:

It was a discovery I did when my old man wanted to start tumbling his photos. He felt stupid that he couldn't upload a photo, when in fact the problem was he didn't understand the (way too) subtle feedback he got.

Apart from some personal opinions on the styling, the most important points are:
- When a picture has been selected, a thumb is shown (some technical constraints here, yes...)
- The photos are primary, the caption secondary. If I needed a rich text editor, I would probably have gone with the Text Post.

Opinions?