In the Art Galleria, find the artwork you want and click to open. Beneath the art image, you will see a box that says "Link for blogs". Simply click into this code box and right click, then copy, everything in this box.

To place the image into a blog entry, start a new blog post, typing your message as normal.  When ready, simply click on the "Insert/Edit" icon in the tool bar (the small tree image).

Now, paste the code that you copied from the Galleria into the Link URL box (that pops up after you click the small tree image icon) and click update.

You'll see your picture show up in the preview box in the blog picture area.

You can do the same thing by copying the Direct link from any picture stored at an online storage facility, like Photobucket or Flicker.