I think your artwork is pretty amazing, but it's hard for me to critique because, since I have a whole different style, I don't really know what you're going for and don't want to steer you wrong.
Very generally, it looks like you are either using a lot of feathering to blend things together or you are using a soft eraser. For me, personally, it looks like these pieces don't really fit together but are sort-of blending via "misting." If that is your intention, that's fine, and it's an interesting style because it's dreamy and otherworldly. But, if you want it to be "cleaner," try using either a hard eraser around the edges (I don't like this method but people swear by it) or using the polygonal lasso tool with feathering set to maybe 3 or 4.
Also, with your reflections, you might want to lower the opacity a bit.... unless it is not a reflection but rather another corporal entity. And, the tree in the middle can be desaturated a bit more, I think.
I very much like this concept! It's creative and well-composed. The sky is really nicely done, and it blends into an all-encompassing mist that defines the dreamy feel.
I think better blending could make it more effective, but that's dependent on how you, in particular, envision your piece. I hope that helps.
hello Carlos, your work is very different to mine, and does have a dreamy feel that I quite like, but can't yet make myself. I like your subdued palette and the soft painted feel, but I did find it a little hard to know the path you wanted my eyes to follow through this work. I presume that was somewhat deliberate, to enhance the dreamlike quality of the piece, and I most particularly liked the work you did with the book and your background/sky blending.