Hi Katie
Thanks for your question and photos.
From your photos it appears you have elements of the diagnosis for tuberous or constricted breasts, albeit a relatively mild case, but this is better ascertained at your consultation. The typical concerns with augmenting a tuberous breast is the relatively tight tissues at the base of the breast and inframammary fold, which doesn't always expand or stretch up normally to accommodate the new implant volume, and the usually ptotic/ droopy nipple which can often be disproportionately large and "puffy" compared to the rest of the breast.
I usually attempt to account for these issues by internally "scoring" or releasing the tight/ constricted tissue at the base of the breast to assist with accommodating the implant, and then often performing some form of nipple lift/ correction as required.
From your photos, depending on the tightness at the base of the breast, it should be possible to perform a moderate breast augmentation and circumareolar mastopexy/ lift with good result.
In particularly tight breasts, a more comprehensive lift, often with an inverted "T" scar, may be required. Post operative breast massage, surgical garments and delayed autologous fat grafting are ancillary measures that might be called upon to further improve results when required. Your Specialist Plastic Surgeon will help guide you through this process, you'll be in good hands.