Excellent results great colors and composition! I agree the background is very pleasing and I like the fact that it is underexposed and very smooth. Looks like you used flash, I find you can often get that nice underexposed background with excellent light to bring the subject to the forefront of the viewer when the flash settings are set up accordingly, looks to me as you have the technique dialed in. I often use this technique to photograph my insects and find it is obtainable even in bright sunlight as long as the flash is used properly. A very well crafted image!