How to import good quality png ?

If i use a good quality png and i put it on a tiny spirite i get a ugly picture. But if i put to a large sprite the image will be nice.

How can i add to a small sprite my png?

You can see the picture bellow, the smallest star the lines are not straight they are like a rasp.

That’s because you lower the resolution (fewer Pixels). Maybe use vector pictures or a 8k Screen …

Try out some specs in the Inspector.