Great to see you are having fun machining Lithophanes!
Tip for embedding picture links
Enter the path to the picture, highlight the link and click the Insert Image icon from the editing menu - looks like a postcard with a mountain and stamp in the top right corner,
This adds - [IMG] and [/IMG] to the path and makes it visible in-line with the post. So linking to your pictures will look like,
(I've included the * *to stop the link working so you can see it)
I hope ths helps,