You are allowed to post pictures created by you and/or other people.

Here are some rules you must comply:

Make sure to put a copyright [watermark/signature/others] on your image if you don't want people to pretend to be you.

Always credit the person/website where you've taken the picture from if it isn't yours.

As much as possible, avoid posting pictures which can notify people on where you live. Examples of these pictures would be the ones with a car's plate number and store names.