I think you should have other objects in the painting besides flowers such as putting birds in the sky or have some bees and butterflies on the flowers. this will give the viewer more to look at than just loads of flowers. The viewers need something to relate to or maybe hidden creatures. You can also show underneath the flowers and make a whole other world in the view of a small bug or animal. The variety of flowers is great though and the colors are vibrant. It reminds me a lot of spring. I can tell you put a lot of work into this and i'm just giving you some suggestions.
From what I am able to discern, the texture in this piece is amazing (the photo hardly does it justice, perhaps find a way to create more depth in the actual photographing of the painting so it is truer to real life). The colours of all the blossoms are also gorgeous and vivid, they keep my eye moving around the lower half of your composition. There is a sense of motion and oscillation in the flowers. I think they would have popped even more if the sky were a bit more of a muted blue (it seems a little too bright).
I've looked at this piece 5 times now. The emptiness of the sky in contrast to the amazing detail of the garden seems to upset me... I keep thinking that this should be the cover of a book and the title words would go into the sky area.