I'll second Lorna, Katyk, the coloration you're doing on these images is amazing. It's obvious you're doing something you enjoy, because the quality shines through. You may not be getting a lot of feedback, but I'm sure that everyone who sees your work appreciates the time you've put in.
As much as praise, a little constructive criticism only helps...
Okay, you asked for it. :-)
As good as the art is, I find that the caption text pales in comparison. I can't blame you for that; it's really hard to come up with something fresh and interesting to say. That's why I don't caption all that much. Most captioning on the web is terribly repetitive; frankly, most of it isn't really worth reading. Your captions are, but they could be better.
Okay, you say, fair enough. But what to do about it? You've got all this art (and more on the way) and it all needs captioning. Here's my suggestion (it's a bit radical).
Keep doing what you're doing and add your caption to each piece. But then throw the field open to other people's contributions, and stick the best one onto the art as "the one" (with attribution). Bear in mind, this isn't gonna happen overnight. You might have to wait days/weeks/months to collect enough suggestions to find a really good one.
Obviously, this can't be done on a message board. Get your own section under "Mod panels", where each piece of art has its own page and text can appear below it (see Jezzi's work for examples). The piece would also appear in your thread, along with a link to the specific page in your section. Give people multiple ways to contribute (e.g., here in the thread or in a PM to you). Wait and see what happens. Add all serious suggestions to the text at the bottom. If and when you get a good one, update the caption and announce the fact in your thread (with attribution). That's sort of like winning a contest. It'll make the winner feel good and hopefully encourage participation.
All that may sound like a lot of trouble, and it may well be. Most of the work would probably lie in setting it up, though, and if that's done right it should be easy to maintain. The advantages are providing multiple ways for people to encounter your artwork, generating interest through interactivity, and (hopefully) improving the captions themselves.
That's my two cents (or two dollars) worth.