<span>Her sketches are unusual because of their unusual perspective, radical use of color, and she uses unexpected subjects. This sentence has an error in parallelism.
The sentence should have been: </span><span>Her sketches are unusual because of their unusual perspective, radical use of color, and unexpected subjects. </span>
Notice how the sentence flows because of the way each "attribute" of the art is written. It flows well until you get to "and she uses", which sounds completely different and ruins the flow. The similar structure that promotes flow is called parallelism.
