meross Smart switch wiring
I think you have your black and brown reversed. The ground green wire is connected to a black and to the box so other than color it is correct. 
The copper hanging out from the wire nut at the black brown, 2 blacks and a brown is that making a good connection? If it is I would put the black on the always hot and the brown on the hot to the light, I looked online for a schematic and only found black to black and brown to brown. That did not help. 
Since your original switch only had 2 terminals on , off control if wired the same way reverse them so the switch is being powered and it should work.