Is it possible to upgrade from 650cc HP to 850cc UHP and is it worth it and will be quite different? (photos)

Thank you for the question and picture. You will find that online consultants will not be able to provide you with specific advice in regards to selection of specific breast implant size/profile. Having said that, it is generally necessary to utilize high or ultra high-profile silicone gel breast implants or overfilled saline breast implants to achieve the types of outcomes you demonstrate with the goal photographs.  Adjustment of the breast implant capsules will also be necessary.

Ultimately, careful communication of your goals (in my practice I prefer the use of goal pictures, direct examination/communication in front of a full-length mirror, and computer imaging) will be critical. 

Generally speaking, the best online advice I can give to ladies who are considering revisionary breast augmentation surgery (regarding breast implant size/profile selection) is:

1. Concentrate on choosing your plastic surgeon carefully. Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.

2. Have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as “natural” or "D or DD cup” or "fuller look" etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup size may also be inaccurate. 

3. Once you feel you have communicated your goals clearly, allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals. Again, in my practice, this decision is usually made during surgery ( after the use of temporary intraoperative sizers). Viewing the patient's chest wall in the upright and supine positions, with temporary sizes in place, help select the best breast implant size/profile for the specific patient.

I hope this, and the attached link (dedicated to larger breast augmentation surgery concerns), helps. Best wishes.

Thanks for your question! Yes, it possible to exchange from 650cc HP to 800cc UHP (not 850cc, that size is not FDA approved & available yet), & I think u would notice a change in shape & fullness, but u should weigh the risks. U really have a great result so far, & any additional surgery always cartels the risk of infection, poor position, & capsular contracture, as well as back pain & shoulder grooving given ur BMI & ur desired implant size. That being said, consult with ur PS about this. Best of luck!