Should I get a larger/bigger chin implant? (photos)

It would be best for me to assess your chin proportions in relation to your whole face, but you do want to be careful about over-projecting your chin as this can be masculinizing. This may also deepen the chin crease above your chin as well. I'm not sure if I understand the gum outline concern you have. I do see shadowing in the area just above where a typical anatomic style chin implant rests. Going with a large implant wouldn't improve that area.We all gradually lose soft tissue volume in that area over time. The best treatment for that area is either a soft tissue filler injection (restyle, radiuses or juvederm for example) or fat grafting.

 A full set of facial photographs are required to make a determination about how the chin relates to the entire facial features. Chin implants also manufactured in a large assortment of both sizes and shapes, which is best determined at the time of the consultation/ examination. The old implant can be removed and a new one placed that is larger, but it's important to remember that the augmentation occurs in three dimensions. For many examples of chin implants from our practice, please see the link and the video below

A larger implant will increase chin projection. My concern is making the horizontal crease at the bottom of your lip too deep. This will depend on the size and design of the previous implant. I do not understand your complaint regarding the "shadow/outline that your gums create".

in your images, you can see the 'shadow' below the lower lip/above the chin implant. IF you increase the size of the implant, this can get even deeper dependent upon treatment of that fold at the same time. It is best not to 'look like' you had an implant so be cautious about 'too much'