First haircut in Japan, advice please.

Thinking about getting a haircut today, but being in a semi-rural area English speaking barbers are limited, and my japanese is still very very basic.

I'm planning to show a picture of my previous haircut, ask for a size 4 on the sides, 6 up top and the back.
[QUESTIONS]

Between the photos and mentioning of sizes will the be enough for the barber to understand what I want?

I like my widows peak and dont want it to be lined up, should I mention this or will it confuse the barber?

Any other tips appreciated.