Does this sound natural?
Reece : So, he is the oldest one but in my opinion he's the cutest too.
He looks like a little kid all the time(3years kid as well), like he's stuck in the childhood;-; I love his cute dimples and cute nose, he has green eyes yeah that's so cool i luv it. He's so funny, cheeky, playful and so adorable.
(I'm practice make a long sentence part 2;-;)

See a translation

@phah Hello. You are doing great. Your sentences sounds natural and is easy to understand. Just remove the word “kid” in (3years kid as well) because 3 years old are already known as kids. You can also use the word “young” to sound more natural. And remove the second word “cute” in cute nose because you already used the word “cute” in dimples. So you can just say:

So, he is the oldest one but in my opinion he's the cutest too.
He looks young (looking like a 3 years old), like he's stuck in the childhood;-; I love his cute dimples and nose, he has green eyes yeah that's so cool i love it. He's so funny, cheeky, playful and so adorable.
(I'm practicing how to make long sentences part 2;-;)

Great work! :) I hope you understand.