Will jaw cracking or always putting pressure on it change the way your jaw/face looks?

No, but. No but cracking of the jaw suggests a TMJ or jaw joint problem. If you're doing it as a habit. you're destined for jaw problems. See TMJ expert for advice. Any dentist can be a TMJ expert with the proper training and experience. Most commonly, oral surgeons, prosthodontists, and orofacial pain specialists. Ask your MD, your dentist and your dental society for referrals.
No. "jaw cracking" is a sign/symptoms of a problem with the movement of your tempromandibular joint (tmj). You may need a bite adjustment, nightguard or other applicance to relieve your symptoms. You may also have arthritis of the joint. A dental exam can help answer your question.