Chin implant for a sharp jawline and to balance face - female, 25?

Without an exam your question cannot be answered. However, your photos are helpful and you are probably a good candidate for a Chin Augmentation. You will need to see an Oral/Maxillofacial surgeon to see if othognathic surgery, genioplasty or using an implant is best for your specific case. It should be noted that patients with severely weak jaws or abnormally functioning jaws may be better treated with other facial surgery (orthognathic surgery), although a chin augmentation may be an option at a later time. These patients should seek the advice of a plastic surgeon to determine which course is right for them. Here is some information to help you make this decision: Candidates for Chin Augmentation - Patients whose chin profiles are weak but have normally functioning jaws are candidates for Chin Augmentation. Many of these candidates have used injectable fillers in the past to strengthen the protrusion of their chins, but are looking for a permanent solution. If you are one of these patients, then you are a likely candidate for chin augmentation

 A full set of facial photographs are required to make a determination about being a candidate for a surgical procedure such as a chin implant, due to the fact that the chin, mandible and the implants  are all three-dimensional structures. It's also important to obtain a natural look. Chin implants are manufactured in variety  of sizes and shapes which is best determined that the consultation /examination.  For more information about chin implants, diagrams and many before-and-after results, please see the link and the video below

Thank you for your pictures! To get an idea of what would a chin implant do for you, a profile and oblique picture would really help.  I agree, from the front your chin does look hypoplastic, however, if you have adequate projection from a profile view then you have to be very conservative with a chin implant as an overprotected chin is just as bad as under projected.  To improve the contour of the jawline, and that is really what we are talking about here, you have to think in terms of lights and shadows.  Highlights bring definition when bordered by shadow - if you look at the pictures you admire of angelina and other models with that kind of jawline this is a common trend among them.  In order to highlight the jawline, yes a chin implant can improve the definition, but sometimes we need to improve the contour around it.  Addressing the buccal area directly above it can do that - and also give your face a more defined, heart shape to it.  It does have its drawbacks, and I hate telling people to do it without conducting a physical exam because it certainly is not for everyone.  Anyways, something that you should absolutely keep in mind.  I hope some of this helps.  Best of luck!