It is common for the breast to lose its firmness and perkiness over time, which is also accentuated with age, pregnancy/breast feeding, weight gain/loss, and gravity. This results in breast ptosis, or sagging of the breast with a "deflated" appearance. Given your history of weight loss and a marked decrease in breast size, it has left you with the appearance that you now have as well as the stretch marks, which are scarring within the actual dermis, and unable to be eradicated except by excision of the damaged skin. It does appear that you would be an excellent candidate for a breast lift, which would raise your breast, lift your nipple-areolar complex to an aesthetically-pleasing position, decrease the diameter of your areola, and provide increased fullness of the upper poles by creating better shape and contour of your breasts. The asymmetry of your breasts may also be corrected during the procedure. While most of the stretch marks at the inferior portion of your breast would be excised during the breast lift, unfortunately, the ones of the upper portion would remain. However, providing the upper pole fullness would ameliorate it somewhat, especially if you considered implants along with the mastopexy to fill out this area. Thank you for your question and photos! Hope that this helps...Best wishes!