Could a chin osteotomy change my square-shaped face into longer, oval shaped face? (Photo)

 Thank you for your pictures. I read that your proportions to your face could be improved. I think that you should start with a good dental-facial analysis buy an orthodontist. In my opinion, you would need of at least a lower jaw surgery possibly chin surgery and a rhinoplasty to balance...

Thank you for your pictures. Prices vary based on surgical experience,the particular equipment needed in the operation and prices change with time. This may be what the market can bear in your area. 

Thank you for your picture.  The skin irregularities are due to a very active mentalis muscle.  There is very little treatment for it unless you have an underlying bony abnormality of your lower jaw and/or chin.  Some recommend neurotoxins to reduce the activity of the muscle but...

 Thank you for the picture. If this picture is representative of your chin more likely you have excess bone. A sliding in reduction genioplasty could be beneficial. I recommend that you seek consultation from a board certified plastic surgeon with oral surgery experience more or a board...