My bedroom

This is my bedroom. It's clean and nice to live in. My favorite part of my room is my bed (you could say it other ways too) on the right with a bluepillow and a quilt on it. There is a big rectangular table near the bed. The closet is next to the table. There are many clothes in the closet which are were bought by my mother. The blue trash bin is behind the door while the big mirror is under the air-conditioner.
I really love my bedroom. It is so comfortable and is filled with my favourite blue!

 is filled with my favorite blue - is worded weird. Do you mean it is painted blue?

are - present tense

were - past tense. Bought is past tense so you would use were instead of are

Google translate

我最喜欢的蓝色 - 充满了怪异的措辞。你的意思是它被涂成蓝色的？

are - 现在时态

were -过去时态. 买的是过去时态，所以你可以使用，were 而不是 are.