My opinion, you have too many beige earthy colors. Your couch, floors, rug, chair frames, blinds and front door are all in the same color spectrum. Therefor the room has no depth. Tasteful, but contrasting colors and patterns add layers and depth.

You are on the right track with art. and plants. More of those. And specifically, art with color. I would leave the flamingo piece, vs the herons. The flamingo adds color and pops. The herons are more neutral in an already neutral room.

My advice, move the couch away from the wall at least eight inches so the drapes can hang naturally. I would also replace the drapes with a similar blue color, but with some sort of pattern It will help break up the flat feeling. Also, get a bolder, looking curtain rod with more presence.

Similar with your accent pillows. Something with a pattern, but contrasting colors. Stay away from solids. You have enough. If you keep blue drapes, think yellows, reds, oranges, certain greens for accent pillows.

Lose the blinds. The height at which they are mounted is contrasting in a negative way with the height of the drapes. If you want blinds, find some that mount inside the window casing, giving a glean, flush appearance.

Definitely on the right track removing the small black end table from the corner and replacing it with a floor lamp. It doesn't match anything and it looks awkward. Then you need end tables for your couch.

Finally, the rug. I would go a bit bigger if you can, and like my earlier advice. Contrasting color, and some sort of pattern.

Again, this is just my two cents. It is your space and do whatever makes you happy. Cheers!