I figured English might not be your first language :)
Just trying to help!
FYI "Skyline" usually refers to the silhouette of the tall buildings of a city - not lines in the sky.
Your layers in action, in Unity :)
Hi Kovach - it looks quite nice. Keep going :)! Maybe make some variants and some other tile types.
Hi Arludus - are these backgrounds horizontally tileable?
This looks nice. I would find it more useful if it were horizontally tillable.