I am 5"7 155lbs. Will 850cc look good on me? (Photo)

850cc breast implants are discouraged in my practice. Large implants such as these may look great the first couple of years but after that can greatly stretch your tissues requiring a lift or revision in the near future. Not to mention chronic pain, capsular contracture, implant displacement, bottoming out, etc. I highly recommend you visit the breast implant revision forum and educate yourself about the complications associated with having large breast implants. Best wishes, Gary Horndeski M.D.

Based on your picture thing going with that 800 mL plus implant is a mistake. This will lead to long-term issues with your implant and the skin of your breast. Your picture looks good at this point and I would not mess with things at this point

The use of a high profile implants is determined by the anatomic measurements on the chest relative to The desired projection. 100 mL implants have a fairly large diameter in a higher profile might indeed be indicated.

Dear Mrsthousand,Although 5'7" and 155 lbs is a good body size for large breast implants, doubling the size of your current implants will not likely look natural or "good" on you.  The size you have looks very proportionate for your body unless the photo is not a good representation of your actual appearance. Good luck!                                              

From your 2 posts, it is clear that you are nervous that you are not making the right decision.  Those are big implants, and you really do need to be comfortable with your choice.  

850 cc's of saline in an implant is quite large. It is hard to predict what you will look like withotu an exam. I would say that the larger the implant the more likely you develop issues from the weight and size of the implants.

Thank you for the question. Ultimately, careful measurements (dimensional planning) will be an important part of the preoperative and intraoperative planning process. Breast lifting will not be necessary.       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 which operation and/or 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 "C or D cup" etc or "look awesome” 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.  The use of  in bra sizers and computer imaging may be very helpful during this communication phase.
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.  I find that the use of temporary  intraoperative sizers ( with the patient in the upright position)  allows for accurate selection of breast implant size/profile to achieve patient's goals as precisely as possible.
I hope this, and the attached link (dedicated to larger breast augmentation outcomes), helps.

It is difficult to assess your situation based on the limited picture you provided but I would think that an 850 cc implant will be too large for your breast.

Clothed posted photos are of no aid! But sounds rather large to me but again its is your final decision to make....