I have an account there from a few years back. I recently notice that they have added some new features, such as making yourself available for services. You can specify your area of expertise (e.g. fashion, wedding) and upload a gallery of relevant work. If you have used this feature, have you had any success in terms of lead generation? I am also curious if anyone had success selling their photos on 500px. Browsing their website I honest can't figure out their target audience. It seems they cater more to photographers than photo buyers but I could be wrong.