The resulting picture is turning out great, I especially like the scene with the carved out leg in the background! One thing I feel the need to nitpick about is the intersection created by the shoulder bone and mountain on the left; I'd advice against this, such intersections really draw in the eye and in this scenario it seems unwarranted.
@Manupix, thank you. It's great to have a pixel virtuoso with tech skills to come to our rescue once in a while.
@Umbohr, I'm delighted, but this is just a frame I made a while ago and I just paste it on everything and change it's colour ;)
Pro tip: insert smiley, right-click smiley, image properties → paste image url. Voilà!
OH! Never knew about FixelJoint, I'll try that right away - thank you!
Edit: It worked 
Maybe the fixeljoint extension gives that button?
Thank you very much for your compliments!
That's weird, I don't see an image adding button when editing the description of my pictures, only add/edit link. Maybe it's a browser issue - I'm using Chrome.
Going back on topic, your picture makes me think of Hieronymus Bosch, and Beksinski, and Dali, that's never a bad thing.
I tried to do it normally, pasting the imgur link through the image adding button, but it didn't work. Then I tried to open the imgur image on separate tab and grab and drop it into the PJ artwork description. It worked. Tried to do grab and drop in case of the second artwork right away and I got the standard too long description glitch. Apparently to make it work you need to use the image adding tool first and paste the link there, which seems to do nothing, but after that dropping it in there will work. Don't ask me why :)
I was using mozilla.
You forced me to spoil the surprise and connect them myself. It looks breathtaking. They connect perfectly into one beautiful castle. 
My 3 finished pieces and the 4th one (that one is just in my head for now) don't connect all that well, sadly. They are more like a collection of random scenes than a complete picture/story, so I definitely failed that particular task.
Somewhat off topic, how do you display the linked image like you've done here, as an image instead of a text link? :)
you are right. I see it now. Easy fix... after the competition ends...