I love pastels! And you use them brilliantly. I love the whole affect of the colors in this piece and, more than anything, I love that one, tiny important detail... which happens to have a single horn.
I love how it doesn't distract from the whole landscape (that's all I thought this was at first), then when I looked at it up close I saw the unicorn. It's just noticeable enough. Love-love-love it!