Question

It's there any relationship between the physical size pic the lilliputains and the way swift wants us to evaluate their behavior

Answer 1

Your answer is:
No.
The Iilliputians are very "large" and powerful in this story! They even imprisonate big, strong Gulliver! Swift presents a sort of oxymoron in this story as the Iilliputians are physically pint-sized but mentally gigantic!

hope this helps;)