Some other advice for you:
You should change your primary preview photo from the picture of the woman with the octopus (?) to the B&W picture of the child. You might be really fond of the primary picture you chose, but my first impression is that it’s not nearly as impressive as the B&W picture of the child.
Also, get rid of the stipulation that buyers should contact you first. I understand why you put it there, but it’s an instant turn-off for buyers. You might as well replace it with, “I don’t want to do business with you.” I’m not joking, that’s EXACTLY what you’re saying.
Again, I understand that buyers are impulsive and sometimes just plain stupid - which means you can’t always deliver what they want - but if you increase your delivery time by another 2-3 days you’ll have the wiggle room you need to fix problems as they appear. And if a client doesn’t respond within 24 hours to your request for more information or a better explanation of what he or she wants, just send a request for mutual cancellation. You can word it like this:
“Dear Client, I apologize but I must refund your order. I require additional information from you to complete this work, but it’s been more than 24 hours since I last contacted you and I haven’t heard back from you. If you still want to do business with me, please refuse this request for mutual cancellation and provide the information I requested. If not, please accept this request for mutual cancellation and have a great day!”