The composition is the position of the subject in the photo.
This is the important factor for taking good photos.

Especially when the subject is a fish, shoot from a slightly lower by using upper angle.

Let's shoot like looking up at the fish.

Shooting a little upward

If the subject is a single fish, try to fit the whole fish on the screen.

If unnecessary things other than the subject are included in the composition, you will not be able to clearly tell what you want to tell most.

Try not to put unnecessary things in front, back, left and right of the subject.

Good example

Bad example

What you want to taking a photo？