Its little tricky in android studio there is no default folder for all screen size you need to create but with little trick.
when you paste your image into drawable folder a popup will appear to ask about directory
Add subfolder name after drawable like drawable-xxhdpi
I will suggest you to paste image with highest resolution it will auto detect for other size.. thats it next time when you will paste it will ask to you about directory
i cant post image here so if still having any problem. here is tutorial..
Drawable folder in android studio