This is truly beautiful! When I saw it, my heart just stopped.
Your style is absolutely lovely. There's also a real grace to your lines and colouring that I really admire! I love the way you've done the shading on her hair and mechanical arm in particular. The movement and flow of this piece is really cool, too!
for a split second i looked away and at the corner of my eye, it looked like her arm moved back O.O that is so cool and your style is very smooth here and the color choice is appealing to the eye... and that water background