I like this one a lot - this "books creating new worlds"-theme is one of my favourites, and the way you've presented it here is amazing. How the bedsheets are transforming into waves... it's a great idea! Also the clean style together with the texture (that looks a bit like rough tapestry) is nice, that way it doesn't look to stiff as it often happens in digital drawings.The only things that comes to my mind as criticisable is the bright tone of red you used here... altogether the colours work well together and the "rhythm" is well balanced, but the red stands out a little too much if you ask me. Well, maybe that's just my screen... but I think a little more dim red on the blankets and maybe a slightly stronger colour for the book cover would have taken some attention away from the blankets and put more focus on the book - which is just a little detail, but actually the main "character" of the illustration. So maybe you could consider the intensity of the colours you use a little bit more carefully... this is someting that happens easily in digital works, especially when someone is used to working with traditonal media. At least I feel like it's easer to have this balance in water colour paintings, since those colours tend to dim as they dry.I hope that helps you a little bit - it's just a little detail, really.