The pictures here show the Arabesque positions, but not the correct execution. Please note the line of the lower back is too arched as well as the hips are too tilted towards the horizontal position.
Try to avoid it!
One of the most important aspects here is to keep the connection shoulder-leg (the lifted leg and the opposite shoulder).
More about the correct execution of the arabesques in one of my next posts.
Good Luck with the Arabesques and let me know if you have any questions Here