And now, a few words from a huge Rinkus fan.
Hmm. Not bad for your very first Rinkus, Although there are a few things wrong.
Pangea is right. You need to make his pupils smaller, he may need a few wrinkles under his eyes, he needs to have a few of his teeth sticking out.
You need to make his neck a little shorter, the shade of pink needs to be lighter, the top portion of his beak (or the stripe, like Pangaea said) is a darker shade ...
Uh-oh, you didn't draw any nostrils in his beak, how can Rinkus breath through his beak?
He needs to have his white neck ring (or collar, if that's how you want to say it)
But I LOVE the expression you gave him. That's funny. I love the surprised "OH, BOY!!" grin you gave him.

If you ever draw a full body of him, don't forget his colored belly, and the inside part of his wings are the same color as his belly.
And remember too, that he's chubby. Remember his long tail *with a leaf-shaped tip*. I LOVE his tail.
I recommend that you should look and study a few pictures of Rinkus so you know more about what he looks like and what his features are, as well as listening to what Pangea said (he knows a whole lot more about drawing and details than I do).
You'll be fine after you study Rinkus's appearance more.