Quoting Joost Cumps
At second look : the handle is a masterpiece! From four to five stars! Funny is, indeed there are no curved bricks that you could have used, but now you didn't use them either :-) I was more talking about use of parts as in the VW mosaic from Ryan Link. If one (Ryan isn't just anyone, I know) can make a circle like that, the curve might be possible just using one directional build.
Anyway, please delete these reactions, if you want, because now my suggestions are really to the point and maybe not that suitable for everybodies' eyes.
No, I'll leave them. :) thanks for the comments, and advice! As I do not like the gaps in the blade, I will attempt a single direction build with a totally revamped blade. Thanks again!