There isn't really a "correct" answer to this question since it largely depends on personal preference. However, there are a few general tips that may be helpful.
One common tip is to start by hanging the largest piece of artwork first, then work your way down to smaller pieces. This can help create a focal point for the room.
Another tip is to create odd-numbered groupings of artwork, rather than even-numbered. So instead of hanging two pieces side-by-side, try hanging three (or vice versa).
It's also important to consider the layout of the room when deciding where to hang artwork. For example, you might want to hang a piece above a piece of furniture, or in a empty space on the wall.
Here are a few articles that might be helpful:
https://www.thespruce.com/how-to-hang-pictures-on-walls-4152797
https://www.housebeautiful.com/room-decorating/g1437/how-to-hang-pictures-galleries/
https://www.apartmenttherapy.com/how-to-hang-pictures-right-the-first-time-231123
