Here's the first one, Quentin. It's your avatar. Now a major problem I encountered with this one is that the top of your head is almost non existent. This means that pretty much most of the hat would not be visible. So, what I did was added height to the picture by blacking it out. Cropped the bottom and then adding a hat for you. Even now it's still not fully visible. What do you think?
If I repeat that same process for the full size image, it will look really bad. The blacked out part at the top will be highly noticeable, and hence spoil the image.
Find me another photo with space above your head, and then we're in business.
The avatar I think looks ok.