I think the stick at the top of the frame is the worst problem...that's the big issue...the stick at the edge is causing what some call "edge flicker". Edge flicker is when an object of some type, some type of element, is right at the edge of the picture, and it draws the eye repeatedly away from the main subject; the edges of the picture area are very powerful. I do not mind the lens's slight purple color aberrations on the rabbit's back, or the slightly soft fur, none of the brushy clutter bothers me much, since the rabbit is a creature of the fields and woods, and all that stuff is its normal habitat.
The second issue is the lighting. I think the lighting is soft, delicate, lovely lighting, with delicate sunlight present, but it is not translated quite to its fullest potential. The way the highlights, and the darkest values are shown is not bringing out that lovely, evening light type of emotional feeling--the idea I have in my mind about this particular image is how to best show that late-in-the-day type of golden light feeling...that's usually done with the curves adjustment function of the image editing program, and also perhaps with white balance and or selective color manipulation or split-toning. I think the idea of rabbit-in-situ is adequately strong in this, but the feeling of the light is the area to work on adjusting--making it more about "the feeling of the woods's edge", and less a good straight rendering of a rabbit.
I would work on the way the highlights, mid-tones, and the darkest parts are rendered...striving for a delicate, light touch to the highlights, emphasizing the golden/yellowish hues and the greens, and not worrying too much about the other parts of the shot. Make it more about the "feeling of evening"...and oh, look, there's a rabbit in this lovely light.