I’d recommend a cozy lounge chair or a built-in daybed for your nook area. The daybed is really great because you have the option of both sitting comfortably or putting your feet up and relaxing with a cozy book (or kindle!).
Here is an example of a daybed from CountryLiving.com.
This cozy lounge chair is great because it helps improve your health. It’s supposed to help with blood circulation, alleviate pressure on your body and promote sleep.
I think something bright would making your space amazing. I really like this blue sofa to match your yellow rug. It will make your space stand-out and inviting. Add a little more decor, like a wall art and flowers, to make it complete. I’d never leave that space!
I would like to suggest you this kind of reading furniture for you to makes comfortable while reading.