Comments, likes, favorites, and group features will all move your images up a bit so even just liking your own photo could possibly move you up over the masses. One of the problems for the search is sorting out the better work, so they give you some easy things to do to move up a bit. Keep in mind that those things only count a little and are not cumulative, but it is a simple thing to move up. The search favors those who sell so just getting the first sale will move all your art up in the search a bit. You should try very hard to get a few sales and not let too much time go between sales. So if that means asking your own customers or friends and relatives, do it, because you have to get the ball rolling. If you are lucky you can get a sale right away from the search, but don't rely on luck. Make some sales happen and then you will get more visibility.