Red apples, dark red with a little blue, with an environmentally friendly color on the edge, with red on the basis of the dark part just now, with the pen washed in the middle and bright part and recolored, with a little yellow or light yellow for each dark red, and finally with a little orange and white for the highlight part, to make the pen dry best. For green apples, according to the environmental color, which color is preferred for dark parts (such as red interlining, blue interlining, etc.). ), the deepest part uses grass green and medium green, the light-receiving surface uses grass green and light green or yellow-green and a little environmental color, and the highlight part uses yellow-green and white. Yellow apples are generally reddish, and khaki, orange, medium yellow and lemon yellow are mainly used to adjust according to the light and shade.