I licensed image No 243311767 from Adobe stock. Preview vas bad, I can see pixels on it but I was sure the full resolution will be fine. Unfortunately, a full-size file is bad quality. Its size is 24mm x17mm - 904KB. Really disappointed.
What program are you using to view this image? I can see it is an Illustrator file. It can be opened in Illustrator directly or you can open Photoshop and choose Place Embedded... or Place Linked... from the File menu to use it there. Opening it directly in Photoshop will not give the best rendering of this image.