I started with small PF, like you. For several first months on DT it consisted of 10 images (or so). The first sale came in a month, the second one did in another month. Anyway, it does not make sense to keep such a small PF, so you should upload regularly, then sales will come.
Your portfolio is very small, so it may take sometime. However, you never know. Most people get at least one sale in about 2 months. But their portfolio's are usually bigger than yours. Hope you get that first sale soon! Good Luck!
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