Do you know the secrets of selling more photos online ?

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I have just made my first sell by uploading a photo to some photo collecting websites and I feel happy about it.( First sell is always encouraging whether it is only worth $2 ) However, I think there must be some secrets for those people who can sell a lot in these photo selling websites. I think photos must be unique and interesting and that's one thing i can think of. On the other hand, good photo with creative ideas and some photo skills are essential as well. There are many apps in this industry which will provide different effect to the photos and I am looking into some of these. I think there are still so much to learn before one can become a big seller in this business. If you know how or any useful experience that you want to share with me and all the mylot members in here, you are encouraged to do so.