In nicest possible way,I'm going to contradict everyone .
For me

its not the number of leg joints that's the issue. It's your feet are too small. All I can think of is The three little pigs. It looks like its permanently on the verge of tipping over.
It's an interesting model ,I've been know to knock up the odd walker over the years. So my suggestion is also a note on just how difficult its going to be to balance as a miniature,and it's likely to prove quite a weak joint on a base and at the ankle.
Mark.