Looks pretty decent. Not bad but there's lines in your displacements and such in the TF2 maps, also the portal maps are a bit bland and boring. I'd definitely consider adding some more details to them then updating the pictures. It's always good to show that you can map out various themes and such, that shows you have variety.
I don't really know much about Photoshop but I think the PS CS3 work looks good. Others might argue they're a bit simple, but I aim for looks only. I really like the green techy one that looks like a circuit board.