I particularly enjoy this one, due to it being an aviation theme and some what of a steam punk feel. I enjoy the colors because it's not as bright as some of your other ones, it's darker with some what of an eerie feel, yet it still makes you want to fly high across the sky. The background really helps to make you feel like your soaring, with the clouds, birds and what not. It contributes to the image greatly. I love the little character and his goggles, he reminds of a steam punk sack boy of some sort. The girl in this picture is just simply amazing, her hair flows perfectly over her shoulder as she glides through the air without a care in the world. It's a real shame she isn't a real girl. I also love the dress that she is wearing, I've never seen anything like it. It's very unique.
5 stars for vision simply because you can really can get a great view from up high in a balloon, both literally & figuratively.
4 stars for originality because I have seen some very similar pieces of art before, this one being superior to the others of course.
4 stars for technique because I think that there is always room for improvement, and also due to the fact that you use the same technique for almost all of your other art.
5 stars for impact because I'm really into steam punk & aviation. Plus the girl you have drawn is so very sweet.