First of all, you want to make a layout that is unique, one that will capture the employer.. dont just copy it, the emploer will be like, "ah seen that shit before, click, close"
Habboi, the dropshadows got to be changed.. if an employer looked at that, he'd be like, "wow, photoshop filters are used everywhere, looks like a 2 minute job, I could even do it!"
you can use the drop shadow, Im just saying, make it face something else other that 30 degrees, and change the opacity and color at least.
Over all the layout is looking very good.. I like it.
Also your title
"Environment Modeller"
Seeing as everything is modelled you kinda narrowed it down too much, instead try to change it to "Level Designer" yeah like I said environment modeller sounds to broad..
Edit;
Another thing, try to refrain from posting levels of HL2 that you've made unless your applying at Valve only. The main thing employers look at is something you created, and something new, so just pulling textures off google and editing them don't count, instead depending on the art style used, go out and snap your own pictures to edit, or paint them in photoshop.
Edit;
Good example;
Here is a kid that did the Game Garage Incubator program here in Charlottetown;
http://curtisjcollier.com/Resume.html