I'm in a similar situation. I'm in DT since october 14th and i have only 62 images on line and 12 downloads. Your download ratio is 0.15 and mine 0.19 (so similar). So, I think (or I hope) it's normal.
I have also been here about the same length of time and not many more sales so for me it is much the same. That said, you have some good images and good ideas so I am sure your PF will see more sales once you have more exposure.
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