Here is it's correct orientation.
Your values are good, and the drawing/handling has the right feel. Many of your colors are neutral toward brown. If you were set up an actual rose like this, you may see very little neutral and begin to see more nuances of color. True and clean color is very important with flowers, and I am guessing this is work from a photo.
The composition is good, but the bottom has two symmetrical arrangements- I would shift one flower to break that mirroring. Also, draw the vase as accurately and symmetrically as you are able.