Check out this awesome conversation with Digital Sculptor Bob Plociennik. Bob primarily sculpts miniatures, which means that his sculpts are typically just about 15 centimeters tall... That's less than 6 inches! 
Learn more about Vertex School here: http://www.vertexschool.com
More about Bob Plociennik: https://www.artstation.com/bob 
Want to be a Character Artist or an Environment Artist in the Video Game Industry? Apply for your spot in our upcoming Game Artist Bootcamp here: http://www.vertexschool.com