no need to visit any Consultant , just visit CIC webpage and visit the immigration portion of this website and you will get all detailed. But you need to spend quality time to get all information.So don't be in hurry !
Its your choice if you want to apply for PRTD , other wise photo re submission request is not an issue as you can send the new photo.80% people are getting the photo re submission request including me.
Best of luck !