Any tips on improving (Rigging)?

Hayhoo everyone °(^-^ o)

so I finally finished my model and rigged it, but its that awesome since some parts are not as I wanted them to be(mostly the legs)
I attached the blender file and it would be cool if you could tell me your opinion and even better would be if you could give me some tips on improving my rigging skills.

Sincerely,
Knikki