I think that the blue and green are your feature colours, so now with anything else try to keep the blue and green and add some neutrals as previously suggested. Lighter walls and/ or curtains will add more light the space and make it appear bigger. Looking at the photo it seems your chairs pick up on the colours in the painting you have. If you are looking to add anymore colours to the room you could use the painting for reference.

This is beautiful, love the use of the dark floor, wallpaper and a touch of blue in the chairs. Well done!

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Anything with colour would be a bonus in your place IMO . So grab 4 cushions in the same blue , and 4 with say lighter blue and white stripes or chevrons ( wiggly things haha ) -- that references the dining chairs and brings in a lighter blue . The cushions are for the couch btw , in case you hadn't clicked haha . Maybe a rug . Definitely a larger artwork with the dark and lighter and maybe a mid blue too , a splash of yellow and orange and grey in places . Suddenly , its gone from drab to okay . One thing I do slightly worry about though is the table top colour -- its got olive green drab tones to the brown IMO , and will probably make both the top , and the chairs , look plain and almost muddy in vibe -- a Japanese Black stain on the table top ( similar to your island front ) would look better with blue chairs in my mind .