I've been a huge fan and user of ImageBrief for a few years now, which if you haven't joined yet, you should! Straight from their website, "ImageBrief is a marketplace that allows buyers to directly request images from photographers. Buyers post briefs outlining their image requirements and professional photographers respond by submitting their images. It's that simple!"
And heck yeah it's that simple! You take images sitting in your archives and make money from them through your own marketplace OR briefs from buyers. It's awesome.
I had the pleasure of guest blogging for ImageBrief this week, spilling the beans on some of my secrets to create more sellable images in super simple ways!