Right, I've only done four lessons in Polish up till now, so I'll do this in English. :)
I've just looked though the sculpts you have on this site and they are all very good. So, my compliments on technique and design.
One thing you might want to experiment with for weapons (they are not that "sharp" as I'd expect mechanical bits to be): if you mix Milliput (or another hard putty) with the green stuff (1:1) you will have a putty that can be sculpted like GS (bit softer) but will cure rockhard. So you can easily create flat sides and sharp edges using a file, knife and sandpaper.