Those type of clients definitely do some bad staff. I am saying from my experience. Because they know they can cancel order they can give low rating then why they need to be done the work first! does not make sense. Also if you look at their budget they offer you more but give you less in the end or they can simply vanish. So always be aware of it. You can show him your works or send him a quick sample using his instructions, I think. This will be good.