Yeah, this is very hard to get right - I tried it before, only I was attempting to make it look like an embryo inside a yolk sac, or whatever you call it. Adding the animation makes it harder again, so you've done pretty well, IMO

I'm not quite sure if you are trying to do the same thing I'm thinking of, but if you are, you might want to play around with the opacity of the outer layer - making it more dense on the extreme outside, almost transparent to about half way in, and then denser again in the middle, but not as dense as the outside. Dunno if that makes sense, or if I'm on the wrong track altogether

but yeah, I think you need a bit more definition on the dragon - it looks a bit vague and two dimensional at the moment.
Still a very good image though
