if you made sales already, keep doing whatever it is your doing.
i'd watch out for the noise. i can't see up close (that close up box should be on), but it looks noisy on the light house and sky shadows.
as for the work - use what you have around you and shoot that. chasing the white tiger that is this site, is impossible. people like what they like and if your looking for that magical egg that will sell over and over -- well, i'm not going to say what that is. but in reality it can be anything. so its best to just shoot what you have already. just always upload the best quality. you will want to advertise these more though, the view counts seem low.
---Mike Savad
MikeSavad.com