I really like the second layout much better....I too think it reads medium. (I tend to only buy mediums...I have to make myself buy lights. Sometimes I use yellow to add bright spots.)
Would you ever consider adding sashings and cornerstones? You could use black and white fabrics for the sashings. That is supposed to help stimulate baby's eyesight. You could use a variety of B&W prints and a variety of other fabrics for the cornerstones.