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I don't like to be a hater but you're really gonna struggle to get that nice. My tuppence, firstly what product is that? It's not plaster and I can't think of anything that'll adhere to wood even with a good wash of PVA. So I hope you stuck a sheet of EML under there (metal lattice stuff) but I can see you didn't use corner beading either which'll mean the edges won't be straight and will chip to buggerey if you breath on them. You'll need to feather much further back from the edge too, even if you're orbital sanding. A good rule of thumb is have it looking square and level and as perfect as poss at every stage because it's seriously hard to 'save' a job, that's where the pro's earn their keep. Sorry for being a critic but a couple of YouTube videos before you attacked that might've helped.
pics please, lit from the side :)