Hi Augustin,
How's that?
I just went to your link, clicked until I got a big image, right clicked and copied the Image Location, then came back here, edited your post, clicked the Insert Image button and pasted the url (ending jpg) into the pop up dialog.
There's more on how in the Direct Linking option available from thsi thread;
HELP THREAD: How can I post images here?
PS it took me a lot longer to explain it than do it
So bottom line is; you don't need to upload here at all, just "direct link" from where they are.
Very nice capture by the way, well done,