This is an example of a recent body-modification trend. This is not a fake leg, as it may seem at first glance. This was actually done to her own leg. Is it as painful as it looks? Yes. Although, it may not be what you think.
What you see is the latest in 3-d tattooing. The blends of special ink to make realistic shadows, and the attention to detail come into play when creating one of these pieces. The designs are generally simple, as opposed to intricate murals, but the degree of detail employed is astounding. Some of these examples are quite impressive. You may get the urge to slap somebody on the shoulder to save their life when the lighting is just right.
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