When I think of an "author's voice" I visualize the emotions, specific word choice , and unique personality the author adds to the overall message of the text. when I read Mrozinski’s article on UrbanMilwaukee site its very clear to hear his personal emotions and thought process throughout the piece. he actively describes how he's feeling, saying how he his "thrilled" and how his "heart raced as I showed the attendant my ticket and entered the first gallery".
He also describes the paintings he sees with lots of imagery to really help the reader visualize the unique details he notices. Describing how the gentle brush strokes ``was teased upon the surface of the canvas" and that the paint was " slathered, smeared, dripped, glazed and scraped". It makes sense he would give such detail of each painting as he is experienced in this medium thus giving us a chance to see how an artist sees things.
Write something about yourself. No need to be fancy, just an overview.