Can’t decide on the right crease height for my Asian eyelid surgery. How do I choose the crease while keeping my asian features?

The fold height of the eyelid  is often determine by the height of the tarsal plate of the eyelid which on average is 5-8 mm in Asians. The other determining factor is the attachment of the skin to the tarsal plate and the levator  tendon. With this being said, the lid crease height would be between 5-8 mm normality. The best height is best determined by you and your surgeon. He can demonstrate the effect of the different heights on you in the office in your consultation.

Your eyes are round.

If you wish to make a larger crease, you may consider increasing the horizontal length of the eye.

If you increase the vertical length only, that will make for a much rounder eye.

You can make the horizontal length of the eye longer by opening the inner corner of eye with Medial Canthoplasty or by increasing the length at the end of eye with Lateral Canthoplasty.

Looking at the photo you provided, you already have a "double eyelid" crease.  I understand that you want the fold to be more dramatic.  This can be done by keeping your current crease height which is about 5mm, reposition the fatty tissue to improve the hollowness which is more pronounced in the left upper peri-orbital region. Keep the tissue resection to a minimum. You will be fine.