Approximate Measurements
54cm x 39cm ≈ 21¼" x 15¼"
The Chinese title of this painting is "Gua Tian Yue Se".
To break it down:
Gua = Melon
Tian = Field
Yue = Moon
Se = Light
This painting has a lot of dream-like fantasy in it. At least, I have never seen a bed entwined in a melon patch in real life.