Cool. I didn't think of using real flowers as a reference which should have been a no brainer! Thanks.It just takes practice. In looking at a close up of the picture, I would suggest getting your petals edges thinner. That will help with them being more realistic.
The roses could be a little tighter in their shape. It helps to have a picture of the real flower you are making in front of you. Helps with petal placement and the overall look.
Nice job though, just keep making them.