How to ask the hair stylist to cut off your hairs less or more on some parts of your head

Question

How would you ask the hair stylist to cut your hairs some more or some less on some parts of your head? Do the following sentences work:

• Cut less hair off this area.

• Cut more hair off this area.

If they don't sound natural, then please let me know how can I ask them such a thing?

Answer 1

You can always say

• Please trim the left side.
• Make it shorter on the right side.
• Leave the center as it is, while making the sides shorter.

Hope that helps.

Answer 2

Your examples are correct; however, it is more common to say "leave this area longer than the rest" and "make this area shorter than the rest" in everyday usage.