Having mirrors at the right place for the right reason, dont't see why it is harmful to have 'too many ' mirrors.
To what I read, mirrors at the dining area is good coz' it 'mulitplies' food supply coz what you see on the table is X 2. Well, guess it helps to promote prosperity.
On the other hand, mirror facing the bed is bad. THo' we have that in alot of the hotels. But that's not good for our bedroom.
Mirrors are superb in expanding space - visually, hence it is useful if they are used cleverly.
However, make sure the mirror is not facing places like the toilet. Believe it is common sense, it is unsightly to see more toilet bowls around. Isn't not?
In your case, the placements of the mirrors seem fine. No worries. Cheers