The Services Agreement should also indicate how long your contractual relationship with your client will last. Is it documenting a one-shot deal? Or does the agreement reflect a long-term arrangement where the client will order your services as needed via task orders?
If the Services Agreement will be renewable, include terms that specify when it is going to take place.
Also, specify the ways in which the relationship may end. You will probably want to build in an escape clause that you, and perhaps your client, may cancel the contract with a particular number of days notice. You will probably also want to provide for the agreement to terminate immediately if the client does something particular bad; make sure to tightly define that list of bad things.