Re: Left Hook- palms down or facing inward?
Palm is supposed to be down or at 45 degrees. Big gloves take away accuracy and smooth delivery so alot of people go thumb up and are in effect throwing a haymaker. Elbow isn't up because of open palm and if it is then you can feel your palm being up isn't natural. There will be a slight strain on the forearm. Ultimately it affects your technique.
Keep that palm down and throw the shot for accuracy. Thumb up and you are covering more surface area on the face, which shouldn't be the desired aim.