I like it.
In all honesty, the design doesn't seem terribly "simple". Either way, your iteration looks better to me than his original character, and I like this piece.
Some little bad things: Her neck and head are both very long. Her eyebrows are too high, and her hairline is also a tad too high up. Her breasts look a little like they're being pressed into eachother near the top, which realistically wouldn't happen without some force pressing them to do that. Her belly area/ torso is a little too short; her hips are too high as a result of that.
Good things: I really love the coloring. The shading is a little too subtle, but it looks good. The character has good detail and personality, and besides the anatomy flaws I pointed out, the line art is good.
Overall, a good piece. For the most part, the flaws are from some small anatomy errors, but those can be avoided in the future.