I took it from a few angles, and the other options seems less impressive. I can try another shot, but I doubt it will be beter then this one. As to under exposure - I still need to figure out the settings for the camera :)
Also, note that this image is a 800*600 jpg which was downsized from a 5MP image - and compressed for web :( so detail here is lost which is not lost in the original image - same goes for the rose.
Few things need adjusting here, this photo is sharper than the flower but its little underexposed, which can be corrected, see attached file. I would have taken this froma a different angel, where you can see the lemon hanging, I think would make it more interesting. Hope this helps, keep up the good work. Regards, Javed