It can be absolutely anything, from abstraction to portrait or landscape.

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As for the subject of the image,
The color of the painting and other nuances in the design of the living room
To fit a painting into the style of a room, you should decide on its color scheme and, of course, the theme. Important nuances that should be taken into account when choosing a painting.

Room size
The larger it is, the brighter and darker the tones can be used. This usa student data applies primarily to walls, but the image can be selected according to the following criteria.

Tone on tone with the walls – the picture seems to become a part of them, focusing only on individual details. The best options would be modular paintings, posters, stickers.
Harmonious with the tone of the walls - suitable for classics, Provence, minimalism.
Bright - thus focusing all attention on it. Ideal for small light rooms, as well as for flashy high-tech, modern style.
The colors of the poster should be in harmony with the overall color scheme of the room.

The color scheme of the painting should echo the dominant colors of the living room.

Web size
The larger the canvas, the freer the space should be. The image should occupy a central place on the wall or in the composition, have a wide viewing angle, only then will it look decent.

A large painting should cover part of the empty wall space.