I also think they could have cropped it a bit tighter to eliminate the twigs. I took a second look at them all, and yours has shadows on the cake itself from the flowery garland while theirs does not. Also, I noticed a bit of wide-angle distortion in yours with the vases on the sides tilting outwards. You used a 24mm lens and they used 85, which would account for that. Sometimes I think wide-angle lenses are a poor choice for objects that have vertical lines that should stay vertical, know what I mean? I mean no offense at all, it’s just constructive criticism. I know I have done it too but this has made me study it and be more aware of it.