Nothing wrong with that, but the rule on board is to do what the majority wants. On board at TATL, TPAC or any other long haul service, most people want to sleep or watch a movie. Both are better done with the shades down.

BTW, while I have glued my face on the windows on short haul flights, I don't see the reason why you would want to look out over the middle of nothing (which is the case for the large parts of the flight).

What I absolutely HATE are shades that are closed during the whole flight. In early October, I was booked in a aisle BA CW seat in the middle block on the upper deck. The other passengers had closed every single shape as soon as they got it and they stayed closed until we deboarded in Heathrow. I never felt that uneasy while take off or landing as I had no reference how high and fast the aircraft or if it was currently turning...