Could I get cosmetic bonding to make my teeth look bigger and fuller with my crossbite? (Photo)

Yes you can, unfortunately you cant do that with bonding, because they will not last for you. The only solution could be porcelain veneers. The bonding will fall sooner or later and with porcelain veneers you can find a solution and also design your smile. It takes only 2 visits, I hope this helps.

Unfortunately you cannot simply add bonding to correct the appearance of your teeth.  The tooth in cross bite would prevent this.  The proper approach is to correct the position of the tooth in cross bite orthodontically.  I would have a discussion with an orthodontist to see what your options are.  Good luck!