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I wonder why you didn't put up a zoomed version of the other three swords, but they look good even when too small to see :P No, seriously: They look great. Keep up the good work and do a good Katana icon, as we heavily lack of one... ^_^
I didn't make a zoom of the 3 last one cause they were done only for fun. At the beginning, I was doing only the first one! The 3 others are only small modifications of the first one! The zoom is there only if you're interested to see the technique used!
Oh I like the second one. You should just add some rust to it and it'll look like an old sword left behind. The third one doesn't look right because it's broken a little unaturally. Think about how a sword strikes and then about what angle it'll break. Try cutting of more at the top and or maybe break it in half and show the missing piece in the icon still.
Few others! I'm doing this just for fun, I'm not planning to use them or anything else so do what you want with them! Those are my first one so they are not really amazing. Hope you'll like them!