Should I be worried about visible incision and puckering 3 days post 415cc hp silicone round under muscle? (Photos)

You are still very early in the healing process.  The implants appear to be in good position.  The puckering and breast shape will most certainly improve with time.  Talk to your plastic surgeon about how to make the scars look their best.

Dear amyslp3,I understand that you are worried. However, you are still in the early phase of the recovery period. Please do allow some time for the healing process to occur. Make sure to discuss this issues with your plastic surgeon.Daniel Barrett, MD, MHA, MS 
Certified, American Board of Plastic Surgery 

Member, Am. Society of Plastic Surgery

Thank you for sharing your question and photographs.  I see your areas of concern but with the swelling that accompanies surgery it can be difficult to know what your long term results will be as it will maintain your implants in an elevated and flattened position.  As the swelling resolves you should see a more natural breast shape develop with improved fullness along the bottom portion of your breast.  Hang in there and allow your results more time to mature.