it is a great photo and 4 downloads in one day is very good, but wait and see what will happen in the next three or four days. If it continues to sell in those quantity over a week you have a strong seller. It's still not popular enough for Top 50 of the week, I'm afraid. I've had photos sell 2-3 a day for several days and then die entirely unless you regards one sale a month as "hot cakes".