I'd say add about 3% noise and then reduce the colour depth and then add gaussian blur before turning it to greyscale. I do my WW2 edits in Photoshop 7 as it has the duotone feature, so I can make them more borwn and grey than black and white...but PSP doesn't have that, so greyscale will have to do for you.

Great shots for a first effort, though. All I did was turn mine greyscale and then post them...LOL.
