Tony, Di,
Don't worry about the shape of the form, I've seen plenty of ceramics that have this shape, it's the colours that you've applied, they really do work well, a very dramatic effect.
I like the orange platters, don't know why, I think it's the unevenness of the applied colour (more to one side than the other) also it's not OTT on colour, very gentle and translucent application which works for orange, too thick and it would look garish.
The others don't work for me though I'm afraid. Certainly the last one looks like its been made wet and a felt pens have been dipped and allowed to run on it.