Do I have enough natural breast tissue for a natural looking breasts after removal? (Photos)

It is difficult to make 100% accurate predictions following explant. There are a number of factors to consider including age (the breast changes over time irregardless of augmentation), weight change, skin stretch and residual elasticity.
Following removal, one can expect:
-Loss of volume- Not an exact correlation between pre- and post augmentation due to the changes over time. You may be bigger or smaller than you remember.
-Ptosis/sagging-Ptosis develops over time and may be worsened by the presence of an implant. If a patient has pre-explant sagging, removal is likely to worsen this to a certain extent. If there is no ptosis, it does not necessarily mean there will be no ptosis after removal.
-Skin laxity/stretch- There is inherent skin elasticity which will allow for some measure of snap back. However, the greater the volume differential pre- and post- the more likely there will be excess skin.
In my experience, it is usually a safe assumption that there will be some changes post removal which oftentimes may necessitate further operative intervention (i.e. lift), however this is often a function of size and length of time post op. Small implants which have only been in place for a short period will lead to an improved response/recoil post removal.
With regards to your specific question, your options will be entirely dependent upon the response of the tissue to the loss of the implant (as well as your expectations). Some patients will have very little laxity and good nipple position. They may be able to forego a lift and instead may fat graft for some volume (or do nothing at all). Others may need multiple interventions to reach a look with which they are comfortable.
Based upon your photos alone, I would assume you would benefit from a formal mastopexy/lift. This will help account for the likely skin excess/laxity. Volume, on the other hand is more difficult to predict with any certainty without in-person exam.
As always, discuss your concerns with a board certified plastic surgeon (ABPS).
Donovan Rosas MD
Board Certified by the American Board of Plastic Surgery
Member: American Society for Aesthetic Plastic Surgery, American Society of Plastic Surgeons
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Thank you for sharing your excellent question and congratulations on getting into such good shape after your child.  Based on your current breast appearance, size of implants, and duration of implantation, you will most likely require a lift at the time of your explant for best results.  Hope this helps.