Hi,
It's very hard to make a call based on photos where only your chin is visible as, end of the day, what really counts is the overall balance of your face. Also, your photos are taken from very close which means they are certainly deformed.
With that said, as a person who did have her chin done, an almost 1cm reduction in height, I confirm that recovery of sensation can be very long so only do if you are sure you need it. Taking account of my initial remarks, your chin is not particularly square but it looks like it might be quite long?
Bon courage dans tous las cas!
Donna