The shadow cast by the window sill (light source is front-center) doesn't match the shadows cast by everything else (light source front-right).
The mortar is rarely perfectly flush with the bricks, so I think it would be a good detail to have the shadows on the mortar be placed a pixel off from the shadows on the bricks.
It feels a bit off that the window cuts some bricks off so that there's only a pixel of them visible. What builder would waste bricks like that?
Window-holes in brick walls are built, not cut through. To make sure the window fits, some unusually-sized bricks might be used, and even when these are less than half a brick, they're usually a decently large chunk to make sure it keeps its strength. When the desired window size doesn't work with that, the hole is made bigger and a thicker frame is used for the window.
In addition, the top of the window-hole (the lintel) usually has a different brick arrangement to make sure the hole is stable and doesn't collapse in on itself. Sometimes the bottom does as well. Here's a
ref photo showing some of the things I mentioned.