Faux Tintype

OK, one for Photoshop junkies here. I intend to get a large format camera here, because I want to work with old techniques. I loved a set of cowboy pics in national geographic a couple of years back, and I think there;s a lot of scope in using old techniques. Anyway, I was researching the tintype process, and tried a photoshop technique on a shot I took at weekend, which I was very happy with. This being Blipfoto, I took this snapshot of a friend (with an impressive moustache) earlier and repeated it, Am happy with result -- within reason.
The process:
In photoshop:
Black and white layer
Blue filter (the tintype is blue light only!)
merge
Invert (create negative -- tintype is a contact negative process)
Solarize (was messing with curves to get the high exposure, but didn't work)
Fill layer, 100 % black (tintype substrate was a black or brown laqured iron sheet)
overlay fill 30-60 per cent

And there you have it. Very happy with face -- the eyes have that look of is it positive or negative, but unhappy with the obvious solarized look of the shirt.

Any tips?