(Hi Pom nice to see you here!)
Yeah, the image posting system on here can be a bit unintuitive. What you need to do is to get a direct link to your images (one with a .jpg or .png or .pnj etc at the end). I did this by clicking on your artwork and then doing right-click copy image link. Then you can paste that link within the image... command thingy like this: (img)link.com/imageexample.jpg(/img)
I'm using round brackets for demonstration purposes so you can see it, but for it to work you use square brackets - or you can click on the little mona lisa icon in the posting menu to get the insert image code immediately.
Also, feel free to pop an intro in the introductions thread!
Spoiler: your artwork show