Is Breast Lift Necessary for Deflated C Cups?

No one can give you definitive advice without personally seeing you, but from what I can see in the picture implants alone would not be a good long-term solution. In the long run, it can make things worse. Part of the decision about which type of lift is best depends upon the size of the implants, since the larger they are the more they will "re-inflate" the breasts. My guess is that the vertical pattern (lollipop scar) would work best.

Based on this limited view, it is my general impression, that you would benefit from a lift. There are multiple techniques for breast lifts and so that may be a more difficult decision. A Benelli may be an option but it truly depends on your measurements and degree of ptosls.