So, I left the piggies with my mentor to be fired, and didn't have a chance to go back until several weeks later.
Now, here's why I should have red-resisted the opposite area first on the Sleepy Pig:
You can see in the background the Lotus Pig has been red resisted for a second coat of the same transparent blue colour.
Also, the second coating of blue gave it more depth, and since I wanted the reflective/flowing look to be reminiscent of water (since, duh, 'Lotus Pig').
At this stage, I was pretty happy with the way things were looking.
Oh, in the background, you can see the Sleepy Pig after it had the coating of orange lustre, after I had peeled the red resist off, but before I had fired it.
...now, time for the part I hadn't given much thought to... designing what I was going to do with the white areas...