Hei Tuomas, Hmm, it's hard to say. The photos seem slightly out of focus. If you take the photos from further away and then crop them you'll get better detail. Also if you use a non white background-blue or grey- then the model is easier to see.
My preference for weathering is to use different effects to build up dirt I use a combination of paint and ground up pastels or chalk and washes of oil paint. Have a look at the articles below for some ideas
http://missing-lynx.com/rareworld.htm

Hi ,nice model but if You built polish "Chwat" You should change camo.Some helpful links



http://wilk.wpk.p.lodz.pl/~whatfor/pojazdy_w_powstaniu_chwat.htm

http://wilk.wpk.p.lodz.pl/~whatfor/pojazdy_w_powstaniu_chwat.htm
http://wilk.wpk.p.lodz.pl/~whatfor/anowe/chwat.jpg

The most important for You is afterwar pic,where You can see 3 colors camo,spots surrounded lines.
http://img5.photobucket.com/albums/v15/jaszczolt/Chwat/chwat_mwp2.jpg
Reagards from Poland

Yep, i know that is meaby wrong. I'm so young, so better for me is training technicues, not look pictures. :-)

But thanks for comments.

Too dirty? Can't really tell to well from the photos... It looks Ok.

If you want a bit more comparison here's a nice site.
Hetzer site