"I suppose that Heartland, Unknown Soldier and Pride and Joy represent not a quieter side but more of a serious side to my work, something I've been getting into recently"

Garth Ennis is recommending that his current works, Heartland, Unknown Soldier and Pride and Joy, represent a more major side to his work. This remains in contrast to his earlier works, which may have been more lighthearted or amusing. Ennis is suggesting that he has actually been checking out a more serious side to his composing recently, and these 3 works are examples of that. He is suggesting that he is taking his writing in a new direction, which these works are indicative of that. Ennis is revealing that he is capable of composing in a variety of designs and categories, and that he is not afraid to check out originalities and styles. He is demonstrating his versatility as an author, and his willingness to take risks and push limits.