Thank you for the question and pictures.
Fortunately, their tattoos are in a location that will not be affected directly by the tummy tuck surgery. they may however be stretched and/or pulled inferiorly and centrally.
Unfortunately, your stretch marks to extend quite high making complete removal unlikely. However, the stretch marks that do remain will be quite low on the abdominal wall. Also, unfortunately there is no great treatment for the residual stretch marks that remain.
In regards to achieve your goals with the breast surgery communication with your plastic surgeon will be key. Unfortunately, the use of words such as "natural" means different things to different people. In other words, what you consider to be natural may not be what your plastic surgeon considers to be natural looking.
Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup size may also be inaccurate.
In my practice I use goal pictures to communicate with patients. With this technique patients are able to demonstrate what they are trying to achieve and what type of looks they do not like as well.
I also use intraoperative sizers and place the patient in the upright position to evaluate breast size. Use of these sizers also allow me to select the breast implant profile (low, moderate, moderate plus, high-profile) that would most likely achieve the patient's goals. The patient's goal pictures are hanging on the wall, and allow for direct comparison.
I have found that this system is very helpful in improving the chances of achieving the patient's goals as consistently as possible.
By the way, the most common regret after this operation, is “I wish I was bigger”.
I hope this helps.