Thanks for the comments guys!! I've just finished the whole panel and took some pics. I've also managed to take some in-progress shots but I will have to work on those in Photoshop before posting. So here's the whole panel:

and a photo showing the actual scale of the wall, each square on that piece of paper means 1cm, so it's more than 13cm high and more than 7 cm wide.

Hope you still like it:) This is going to be the master model for my mold so if anyone has any ideas or advice this is pretty much the only chance to change anything.
I still have to finish all the details on this panel, but after that I will try to do a corner piece that works with these wall panels. I will hopefully post some pictures soon. Cheers!
dsc.
PS. I will write a short "how to" in my next post as soon as I finish working on those WIP pictures in Photoshop.