Pic #3 looks very suspicious, I like the next one though, nice direct joints in tension, heavy splines to take the remarkably high horizontal forces resulting from a low pitch roof.

I've never been a big fan of curved timbers in bending or tension, not natural. They are pretty but I lean toward simplicity, form follows function. However the second to the last is very sweet! The reverse shoulder cut on the "spring loaded" curved ties...that's nice... the only reason not to like that one is I didn't think of it!