What size are these breasts? How many Cc would I need to achieve this result starting at a 34A?

You need to be measured and examined to see if your goal size is even an option for you or too large. This will be determined during the consultation.

Wish pics... well I think there is no surgeon in the world that could guarantee you will have a breast just like any photo (because each body is different)
But I will tell you what has to be done in your breast augmentation evaluation so you could have the best of it.
As for the 1st step in your breast augmentation with a plastic surgeon: I have to know how much volume you have in your breast, 2 details here, I always ask for your actual cup size and 2nd I measure your breast with breast sizers to know the exact volume.
This is because most women don't wear their bra as "the fabric wants" because they are comfortable with a bigger/smaller size and each cup size has a volume.
ExampleCup A 150 mlB 300C 450D 600
So, this is the starting point to know what cup size you are and after knowing this (i.e., you are a cup A so you have 150 ml, or less, and if you want to be a B cup, we need at least 150 ml to get you there... just doing the math)
after that we have to know if you have enough skin so the implant won't be palpable, so we do a pinch test and if you get more than 2 cm (we measure with a special tool) of tissue that can protect the implant by covering it I recomend you to have a breast augmentation above your pectoralis muscle, if you get less than 2cm of tissue I really recommend you to have a submuscular breast augmentation (or a dual plane breast augmentation for a natural look) so the implant gets covered by a layer of muscle.
After these points we need to know what cup size you want, or if you don't have a clear idea we bring a special Bra-sizer with special implants so you can look in the mirror an approx. of the result. these special implants range from 120 ml to 450 ml, so you have plenty of choices.
at the end of the consultation, you can also ask your doctor for pictures B & A of patients with your body type so you could see a result with the volume they chose.
A good plastic surgeon will take you through this step so you could make the final and informed decision, remember it is you the one that determines the volume, not other person.
I hope this information helps you.