Here's the link to Jian Guo's pieces, courtesy of Janice
Of the five pieces linked to here (I'm not clear on whether this is the whole set or merely a representative sample), "Rest in Gildor's Forest" is notable for depicting a scene we rarely see illustrated -- though it's also the only one in which I spotted a factual error (four hobbits where there shd only be three). The five pieces, in their proper sequence, are
"Birthday Party of Baggins"
"Rest in Gildor's Forest"
"Deep Into Moria"
"Welcome from Lothlorien"
"Gates of Argonath"
Given that all these fall within the first volume of LotR, I wonder if there'll be a second and third set to cover THE TWO TOWERS and RETURN OF THE KING. I wdn't be surprised if these five aren't at some point made into posters (a la the old "The Journey Begins", with its almost black-light vividness of colors).
In any case, an interesting example of what Tolkien, in his Letter to Waldman, called "other hands".