What is the ceiling height ? You can add some addition moldings / panelling above the existing door.

I would tend to agree with the architect because they have the vision of the entire space. This is a discussion you should be having with him/her so they can explain why 10 feet is better, or they can adjust it to your preference.

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what is the recommended height required when we want to opt for false ceiling? Answer : ( 8'-6" below false ceiling...) 2) what are the pros and cons with false ceiling? Answer : Advantage is... 1) If ur staying below terrace flat, False ceiling will to reduce heat. 2) To hide electrical wiring conduit pipes which will hide inside the false ceiling. 3) to hide any electronic devices inside the false ceiling, by using trap door, to service the wiffi, telephone, router, etc. 3) how much does it will cost for 1400 sft 3bhk? Answer : ( 2 Option ) 1 Option ) 1400 is not totally will be used for false ceiling, i hope except balcony, bathrooms, etc here it is not necessary, so asume only 1100 Sq.ft Carpet Area = 99000/- Flat ceiling. 2 Option ) Additional design ( Up / Down - level difference for Cove Lights ) Asume 35000/- Total Cost = 1,34,000=00 4) is it only for aesthetics purpose or any functional advantage? Answer : Both as Explained Above. 5) how much overhead interms of maintenance? Answer : No Maintenance Cost, If not damaged by water. 6) any alternatives for false ceiling to get good lighting and rich look? Reflected Cove Light which is mentioned in Sr.No. 3 ( option 2 ) Additional Cost