I'd say I like the first one better as a concept, but that there is something that makes it 'unconfortable'. The yellow background overpowers the flower and catches the eye too much in my opinion. By catching the eye, it also bring it outwards and makes your sight leave the image. I'd try to desaturate it a bit to make it quieter, or may be just a tiny amount of vignette to bring the eye back to the subject.
In the end, its just that the yellow should be tuned to makes the flower pop more whithout robbing the show.