First of all, it is best not to draw alone. If you divide the layers, put the background layer under the people, so as to see the picture effect at any time. Secondly, you can adjust the color of the picture after coloring. The filter on the menu bar sai-hue/ saturation brightness/contrast can adjust the color of the layer at will, and adjust the color of the background layer to your satisfaction. The trick is that if the background is cold as a whole, then the characters can't be warm at least, and vice versa.

In addition, when drawing people, you can create more layers and add transitional environmental colors (background colors) to reflective parts such as clothes and skin. Can make the characters more integrated into the background. For example, if the background is backlight, white reflection can be added to the edges of clothes and people, and if the background is blue seaside, light blue with opacity of about 30% can be added; Create a new layer with color filter mode and opacity of 25%. White the sunny part of the picture with a soft corner brush; Create a new layer with positive overlay mode and opacity of 15%, and add black at the backlight/shadow of the picture, which can make the overall light-dark relationship of the picture more prominent.

Finally, the painting style of the background should not be too different from that of the characters. If the painting style is unified, the picture will be unified.