For your pre-app/app pictures, you need the following pictures:
A picture of you from the front, with your helmet on, your hands empty and at your sides. In fact, for all the pictures, except your "Bucket Off" picture, you need your helmet on, your hands empty and at your sides. For example:
A picture of you facing to the right:
A picture of you facing to the left:
A picture of you from behind:
Your "Bucket Off" pic - for this you can hold your helmet or set it to the side, and you need your entire face exposed, so if you wear a balaclava underneath your helmet, you'll need to pull it entirely off, or at the very least, have it around your neck, fully exposing your head:
You also need a picture of your weapons:
And unless your Ruus'alor asks you on behalf of Regional Pre-App - or the App Team itself in the case of your actual Official Membership application - for close ups of any particular item of your kit, you do not need to submit it with your Regional or OM application.
I hope that helps.