This is a great take on the challenge! I even like the little sign that you made. The roses are beautiful, and there the nice big ones, not the little ones you can get around me for 9 bucks a dozen.
The cropping in this shot is VERY tight at top and bottom. I could forgive the bottom, but at the top you cut a rose in half and that makes for a big distraction. If the shot itself was tight and you couldn't crop out farther, I would have tried cropping tighter at the sides for balance and made a small frame around the image. Don't know if it would help, but I would have tried it!
The colors here are a bit dull especially around the outside of the bouquet. The center of the arrangement is blown out. Also, the overall effect of the shot is very 'flat'. It has no depth or texture to it. This makes be believe that the flash fired giving to much light reflected but not good light for definition and color. I also have a point and shoot type camera like yours. When I do my still life pictures I find I get better results by turning the flash off and using a longer exposure and a tripod. Use as many lights as it takes to get a nice effect and don't be afraid to move the lights around and take many sample pictures. This will help to bring out the gorgeous textures that are naturally prevalent in roses. It will also help bring out the colors.
All in all this is a very fun compostion that with a little experimenting and practice could be a GREAT photograph! Keep shooting!
TC
I feel this should have even been a close up shot or probably vertical. There is a lot of empty space on the sides and yet the top of the bouquet has been cropped. Cropping off some flowers is sometimes ok if you have it full frame and there is cropping on all sides, but because this is only at the top I feel it has a severed feeling. The mix of pinks and reds on the flower are good, lighting is good with nothing blown or too dark. The connection to the phrase is good. Only thing letting it down is I think it really needed to be a vertical shot.