Breasts are symmetric. Actually, the left side is usually larger than the right. Size is subjective. The breast usually reaches the sixth rib. Average volume would be a B or C cup.
Nipple is well above the fold and points outward.
Overly large breasts can be a difficult problem. Place a pencil underneath one breast. If the pencil holds, some form of lifting in addition to volume size may be recommended. Breast enlargement is usually performed by implants. Chest wall size and the amount of loose skin in which to place the implant are limiting.