Is Satan physical appearance ever described in the Bible?

Yep. He was the most beautiful of God's angels. 

He doesn't have a physical appearance. He is a spirit.

He loves his original form , ive never seen it but its a male angel 

The bible doesn't give a physical description just like Jesus etc

But God made his angels in his image

Artists use imagination

Yes you are right, fear was heavily sold to the public in the dark ages and it still plays a big part in Christianity.

How many Christians would there be without the fear of hell or the promise of a fantasy heaven. Close to zero?

He is described as being rather short in stature, and morbidly obese, with strange hair and rather small hands.

-𝒞ℴ𝓇𝓋𝓊𝓈 ℬ𝓁𝒶𝒸𝓀𝓉𝒽ℴ𝓇𝓃ℯ

Before the Fall he is described by Ezekiel thusly

Ezekiel 28:11 Moreover the word of the Lord came to me, saying, 12 “Son of man, take up a lamentation for the king of Tyre, and say to him, ‘Thus says the Lord God:

“You were the seal of perfection,

Full of wisdom and perfect in beauty.

13 You were in Eden, the garden of God;

Every precious stone was your covering:

The sardius, topaz, and diamond,

Beryl, onyx, and jasper,

Sapphire, turquoise, and emerald with gold.

The workmanship of your timbrels and pipes

Was prepared for you on the day you were created.

In the garden he described as a serpent. Oh how the mighty have fallen