Can Emsculpt be used for pectoral muscles? (Photo)

Emsculpt or any other electromagnetic stimulation device should not be directly used over the cardiac region secondary to possible induced conduction abnormalities. Please contact a qualified provider or a board-certified physician with extensive experience in these procedures.

From the single photo submitted, it appears that you are still developing muscle in the areas you are concerned about. So my answer will cover several phases:
1) Emsculpt is not indicated to be used over the chest area. It may have a negative  affect on cardiac muscle, such as interfering with normal rhythm or even death. So, until further research is done for use in this area, stick to a regimented upper body workout at the gym.
2) The new paddles which are approved for extremities, can certainly augment your upper arm workout. They can also be used on the legs.
3) You would benefit from counseling from a certified personal trainer who can guide you in diet and supplementation use, along with a “building” routine in your workouts.