Decide which layer leads

Look at the reflection and the view through the glass separately. One should provide the main subject while the other adds context. If both layers are equally complicated, move until a dark surface simplifies one of them. This can make the combined image far easier to understand.

Use a small change of angle

A step sideways can shift reflected lines across the interior without changing the window itself. Work slowly and notice where the two layers meet. A reflected tree may frame a shelf, or a building edge may divide a patch of colour. The useful position is often very specific.

Respect the boundary

A window may look onto a private space. Keep the exercise focused on public displays and ordinary reflections rather than personal activity inside. Avoid blocking an entrance, and leave the glass untouched. The most useful photograph is often made from a comfortable distance.

Use this as a starting point, not a fixed formula. A useful photograph begins with attention to the place and consideration for the people who share it.