Firstly:
Originally Posted by
Coffin Dodger
I'd have had it dry-lined, much less likely to crack, and should give a better finish generally.
Plasterborads have cracked plaster as much as, if not more than new solid walls!!!
Anyways, your cracking is nothing to worry about as long as the plaster doesn't sound hollow when you tap the backs of your fingers against it.
If it DOES sound hollow, then its not stuck against the base layer of render and would need to come back off.
Assuming it is stuck to the wall ok, follow the advice above regards painting and filler and you'll not see it after. In fact, you'd be amazed what a couple of coats of good paint can cover up!