There are many things to consider when purchasing art. Color, style, size, statement, what you love, or a way to escape.
What matters is that you find something that compliments the space and your personality. Look for a piece that attracts you to it, it doesn't necessarily have to be about matching. Art can be bold and colorful, it can make a wall pop, or it can be minimal in the background to fill a space or make the room your own. It can be a great focal point and a statement piece.
Whatever you are searching for, make sure you buy what you love.