HI there, i wanted to be the first to post some artwork and take the time to demo the differences in linking images.
This is a drawing i made yesterday as part of a training session. In order to post it here I ended up re-scaling the photograph to be optimal for upload, since the original was kinda big and would miss the point. This might be something to consider with your artwork, even if you are uploading it to a third party site, having a lower resolutions simply makes it quicker/easier for people to access it.
This is the imgur version, added with the "Add Images" button:
And this is one made with the DnD of the file_icon in the post interface(hosted in the GD server):
This is posting of an imgur link(no direct image, this will NOT generate a thumbnail):