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 what may or may not be required. Chin implants are manufactured and a large variety of sizes and shapes, some of which can help with the pre-jowl sulcus in addition to the projection of the chin. The chin and the implants are both 3-dimensional structures, so the size and shape is usually determined at the time of the consultation and examination. Liposuction is only performed in the neck when there are fatty deposits in that location. Rhinoplasty is a difficult endeavor, so make sure you choose your surgeon very wisely based on extensive experience. Digital computer imaging performed in the office setting would also be helpful to understand what can be accomplished with both procedures. For more information and many rhinoplasty/ chin implant before and after results, please see the link and the video below.
A chin implant will not help jowling. Small cannula liposuction with the chin implant can help or a small jowl lift procedure done at the same time.
With out photos and any personal information, there is no way to answer your question. Age, weight, facial structure, anatomy, etc. are needed to make a diagnosis and formulate a treatment. These are also questions your surgeon should have or been able to address.