Wuaa it looks amazing! It's hard to put so many details in a drawing and yet keeping it clear and not chaotic, you did that very well! The design of the girl is really nice, it is very simple but the colours you used make it stand out from the usual school uniforms. Also, I love the hair, the colour, your way of shading it, the structure, and the way it's falling alongside the tube, it makes it more realistic and I love that kind of technique.
The contrast is another thing which I really like, the robot (?) has dark, shadow-like colours, while the girl is very bright coloured with red and yellow which make her stand out even more and draw the focus to her. I also like the spot she is standing on, it has a rosy glow on it and it looks safe and warm against the dark colours in the background.
The first thing I noticed in this drawing is the tube, the colour is so different from all the other colours and that is what makes it so interesting, I love the light it emits.
Overall I really love your style and it looks like you put a lot of work in it, a very interesting concept as well!