I can't possibly fathom this not being a duplicate, but I looked...
Two straight-forward questions that are extremely similar to each other (hence included in one post). If they need to be separated that's fine.
1. What is allowed in a profile picture?
2. What is allowed in a profile description?
Maybe easier to answer in the form of what isn't allowed.
The ideal answer would be something referencing a living document. An answer that doesn't get obsoleted over time and can be referred later, if needed.