Helen's car isn't very big. She wants a (НЕМНОГО побольше) one.
Helen's car isn't very big. She wants a SLIGHTLY (A BIT/A LITTLE) bigger one.
My job isn't very interesting. I want to do something (ЧУТЬ более интересное).
My job isn't very interesting. I want to do something A LITTLE (A BIT/SLIGHTLY) more interesting.
He is very tall. But my brother is (НЕМНОГО выше) than (he/him).
He is not very tall. My brother is A BIT (A LITTLE/SLIGHTLY) taller than HIM.