Use the smudge brushes “Wet bristles” or some other ones and in the brush editor use the overlay mode. With this mode you can paint over the photo on different layer but picking the colour from the photo layer beneath with the smudge brush this will make it like wet brush strokes.
Then there is rgba brush here in the forum by @emilm - Rotating light brushtips WIP Add strokes with brush.
There might be some other embossing type of filter in gmic I have not checked it enough which will give you this type of look.