Hi Osie, you have certainly taken this idea and made it very much your own. I like the choice of a poppy as your colour splash and the shape you have chosen adds interest, however the success of a minimalist composition such as this is entirely dependant on where the weight falls and this feels a bit top heavy to me. I would drop the main poppy down to the level of the two little ones (keeping the picture shape the same) then lose the two little ones which I feel are a bit of a distraction.
The other suggestion I have is more technical but you may find it useful. You have used Drop Shadow or Outer Glow to surround your 'vase' shape, I find this horribly restrictive to work with and a bit mechanical in appearance. Try making a black copy of your shape on its own layer underneath the white one and adding a lot of gaussian blur. This gives you complete control over your shadow allowing you to move it, distort it and even rub it out where you might not want it (like maybe under the table).
I wouldn't normally be so critical of a piece of creative work... but you did ask.
But when all is said and done it is your choices that make it your
picture and you have ideas in here that make me want to return to the subject afresh, so cheers for that.