One on it's way

A few weeks ago on the train back down South to my folk's house I had a flash of inspiration for a new illustration. Not quite sure where it came from, particularly as it has no connection with trains, but perhaps the boredom of a lone train journey sent my imagination into overdrive as it served as decent entertainment in the absence of a good book.
Actually I suppose it was kind of born of an old idea I had to do an illustration which featured manta-rays -  amazing creatures which look like they're flying under water. So that idea became this sketch that i was able to do as the starting point of my image last week:

I'm nearly finished this piece now, so perhaps tomorrow evening it will be done and i can reveal the completed image.
Just got back from a few days away and i'm itching to get stuck back in, so i'm off now to do some more work on it. Not that i'm a work-aholic or anything ;-)