Last night, I started tying knots.  I found this picture somewhere on Model Ship World.  (I'm sorry, but I forget where...)  And I liked the looks of these knots.   Two things became clear pretty fast.  First, it was hard to tighten the cow hitch.  I'd put some tension on it and it'd look good, but as soon as I let go, it loosened up.  Second, I'm not sure how to tie those clove hitches.  Mastini recommends simple overhand knots in his Ship Modeling Simplified book.  Those are certainly simple