How to make an image outline?

Question

Adobe Photoshop

Tell me how to make a stroke on the picture (about 5 pixels), let's say I have this picture

(this is a low-resolution picture, the one that I made more clearly weighs 40 times more and the size is 10 times larger)
I gave it more resolution with the help of neural networks and clarity, it looks great, only the border itself is blurry and a little "square", if you add a solid, let's say dark gray border, it will be just what you need, but how to do it?

Answer 1

1) The picture must be cut along the contour (the little man himself, if the contour should be on it).
2) In the "layers" area, right-click on our layer and select "overlay options" - there will be a stroke or outline overlay function