Does the prayer of one who beautifies his prayer before people become invalid?

Do not pay attention to whispers nor care about them. Pray and perfect your prayer, no matter how Satan whispers to you that you are beautifying it for people. Do not abandon righteous deeds for fear of showing off, for this is one of Satan's ploys. Completely ignore these whispers and proceed with your prayer and acts of worship. Know that they do not harm you, and you will be rewarded for them.