Only a small selection, Mark, but yours is the kind of work that got 500px so popular in the first place. Excellent.
By the way, I don't know if you realise that you can choose which part of the picture is used as a thumbnail. A couple of your titles didn't make sense until I clicked through to see the photo because the 'important' bits were not shown in the thumbnail.
If you click 'Edit' on the photo page you can then drag a bounding box around the portion of the picture that you want shown in the thumbnail. You can then use the handles to resize or move the box. Click Save and refresh the main page to see the results.