Overall, a nice calming wallpaper. Very sweet and simple.
My biggest piece of advice is to be more cautious with layers; there are shadow layers overlapping things they
shouldn't or on top of the lineart. It's most noticeable around the cage.
There are also a few lines that are noticeably the wrong color or don't meet, etc., but those are easy mistakes to
make and fix.
Keep it up! :)