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Indoor doors generally do not need to have a door head, which will make the interior door appear too high, and will not be in harmony with the wall or the decoration of the whole house.
What color looks good depends on personal preference for color, as far as I think is better than red, of course it can't be bright red, bright red is a little too festive.
It can't be changed unless you choose a new one with ventilation. Because the security doors are all fixed styles made of fixed molds. It's not like tearing down the door and opening a new hole.
That depends on the style of your entire renovation.
The process is in place, the quality is also good, and it is beautiful.
It is mostly simple and fashionable styles, which are very beautiful and durable.