What an incredibly creative and interesting idea!!! You may want to look into the perspective of the cloth (you can use Distort/perspective to give it some depth) Experimenting with the burn tool to give the vase some dimension.. just gently rubbing the edge to give it some roundness.. not necessary just a suggestion.

You may want to anchor the flowers (though floating them is effective) the choice is yours. Adding stems would be a bit of a work out, but it would make the image come together tighter.. well in my eyes any way.. and my eyes are pretty effed up so take that with a grain of salt.

GOOD LUCK!! (and great job)

I agree with Driven. The concept is incredibly unique and creative but would look a lot better with a 3D dimensional effect, some stems on the flowers and using some perspective on the blue check to make it look more like a table with a tablecloth on it than like an apron.