1. Check the canvas, regular oil painting cloth texture can not be disorderly, the oil painting to the sun, can not appear light, otherwise easy to corrode and weathering.
2. The canvas of old oil paintings has some signs of open weathering, and it is difficult to imitate the oil painting.
3. The characters on the oil painting are different from the bottom varnish of the scenery.
4. Frame of wood is better, the overall look frame to be nailed to specification.