If you have a gap on corners of brick wall and window sills,.

Gap between window trim and wall. There are several fillers you can use to seal the gap between a window and a brick wall,. I can't say for sure due to the angle of the pictures, but that doesn't appear to be the case. If that is the case probably replace the window unit with a better quality unit & make sure it's installed properly.

For best results, the gaps should be air sealed before the trim is placed over the top. The frame controls the door panels. If its sheet rock, some joint compound may be in order although that may crack in time.

On one side of a window, the trim might be flush at the bottom of the window and then widen to a 1/4 gap at the top. They look nice, it really improves the look of my home. While filling these gaps, keep some space between the sills and windows for easy cleaning of your windows.

Gap between window frame and wall. However, most people googling how to fix the gap between the window and the frame mean between the window frame and the wall or the window trim and the frame. At the very least, expanding foam all around the window between the frame and the window.

I can't really find any consistencies in gaps across these 6 windows. If the gap is 1/4 inch or larger, the backer rod should be the same thickness to fill in most of the gap before. This is between the bottom of a window and the wall (this is rare;

In most rooms the bottom and sides of the trim is pretty flush with the wall): So there may be gaps among those panels, frames, and walls. Brickwork standard means a reveal can be 8mm out of plumb.