I would put them on shutterstock, you should get paid for them, they're great work! Also you will find that employees (journalists etc) prefer to use paid for GFX, where the license is clear. So they just hit up paid for GFX sites.
Maybe put them up lower priced than the competition and make a load of different popular aspect ratio renderings and compositions.
Here's how I'm using the GFX in my current work in progress application: