Talking to work colleagues in a baby voice is not appropriate.  Ever.  Unless you no longer wish to work with those people.

When one is out and about, one should spend time enjoying said out and about, not spend the whole time photographing them and their friends in extreme close-up.

Do your hair once and one only before you leave the house.  Then if absolutely necessary, touch it up in the ladies room.  Unless you are Miranda Kerr on a photo shoot for Vogue, your hair must not be done and then re-done in public.

If someone has (a) food on their teeth, (b) toilet paper on their shoe (c) lipstick on their teeth or (d) their skirt caught up in their tights, tell them quietly.  It is always appreciated. 

Regularly delete your texts.  No good comes from keeping texts.