What should go on an Illustration Invoice

from Business of Illustration (really helpful website for dummies like me btw)

1. Your name
2. Your contact info
3. An invoice number
4. The client's PO number (only if applicable)
5. An invoice date
6. The client's information
7. A description of the work done
8. A tax ID number
9. The total fee due
10. Payment terms

Invoice examples: I want to keep my invoice simple. I think the examples below are the kind of look I want to go for - everything clearly laid out and easy to follow.