Dan,
I don't feed my flickr or 500px accounts, and am only half way at getting a photo shelter site going. So what I have done with the few photos that I've posted is to go through the GetDPI site itself. I upload a photo to the gallery, and then link to that.
In photoshop, I'm using Tony Kuypers actions, and he has a real simple and effective way to save images for the web. You choose a size to save at and the action resizes your original and pops up several layers that you can then fine tune to your liking. One layer sharpens more aggressively and produces more haloing and has a luminous mask attached to it. On this mask I usually paint 100% black with a small brush over the high contrast edges that will show the haloing. The other sharpening layer is less aggressive. I usually opt to sharped less than his default and lower the opacity of each of these two layers. It's fast and easy and does a good job presenting the image. I then use the save for web to get my jpg.
Don't know if this helps. By the way…your stuff is great!!!!!
Rick