Hi Darlene, questions are GOOD!!
Adding a clause that it is the
client's responsibility to proof the final project leaves you off the hook for errors and ommissions (of course, this doesn't mean they're OK to pass on to the client...but in terms of who's legally responsible.) Unless you're creating legal documents for clients I don't see how it's a necessity (someone else may disagree with me on this, please say so if you do!)
As for a 'refund policy' I don't have anything of the sort in writing for a few reasons not the least of which is I don't want to even present the idea that that's something that is ordinary or normally going to happen in my practice. It implies that I mght have a need for such a policy (ie, lots of unhappy customers asking for refunds.) AND it will encourage certain types of clients to request a refund for every little thing.
Now, that's not to say that if you have an unhappy client you can't brainstorm and offer a financial comp to get them back on track again. But advertising that you do this is asking for all kinds of trouble
One relative point - when we take a deposit from a new client it is clearly marked as '
non-refundable' - otherwise I never use the word 'refund' in my agreement literature.