A sample of my recent images on 500px can be found here.
Commercial use: is permissible with a license via my 500px Prime store. If you see the one you want isn't on the store - let me know, and I'll upload it. Note - commercial licensing will require you to pay for an image. Requests for commercial licensing for free will be rejected with sarcasm.
Non-profit use: All photos are Creative Commons licensed (BY-NC-SA) - which means you can use them on-line for a personal blog if you attribute me & link back to this website.