Very nice work (I LOVE futanari pieces and you executed what I like about it nicely). The linework is a little bit strange in some places however. Of course, nobody is perfect. I personally try to get my lines as consistent amd smooth as possible, or to the best of my abilities. The first color-palate has a very nice contrast in colors, and the last one is nice to look at, but there's just one thing about it. The shade of purple and black are a bit too close, and can make it difficult to see the difference between color. Other than that, there isn't much else to other than great job.