Are you able to provide more pictures and possibly a rough sketch of the dimensions? If you start by painting the walls white that will already make it seem bigger and then place a 5x7 rug down to group all the furniture in the seating area, I don't know if this is the only set up option available. How about swapping out the pillows from the two chairs and placing the orange on in the center on the bench seat. I would also recommend placing the mirror over the other sofa around 8 inches above it and can you move the magazine rack to either side of the chairs? Put only a small pile of magazines on the coffee table and tuck the shoes under the folding chair. If you try that, let me know how it looks, good luck!

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You may get a lot of opinions. Here is mine. I like your brown furniture. i can see that it provides a lot of seating.

I think you should paint all the walls white. I can see in the mirror that you have a lot of things hung on the walls. I would simplify, and choose one large item for each wall, or else a tight grouping. It helps a small place seem larger and give you space to breathe, if you put the small items away, out of sight. Perhaps a basket or box that can be tucked under the couch . I would put the magazines away, or throw them away. Hide the clutter, as best you can, in a small basket.

I agree with Mon that the next thing to do it choose a rug. A bright rug will make things cheery, and then a couple pillows. I would do either a patterned rug, and simple pillows, or a simple one-color rug and patterned pillows.