He turned as red as a tomato / lobster-red

He smiled nervously.

He could not believe it had happened, and in front of everyone too.

I buried my face in my hands while hot tears of shame stung my eyes.

My face flushed red and I stared at my feet, hoping no one would notice how embarrassed I was.

She hung her head in shame upon realisation of her careless mistake.

She was burning with embarrassment when she realised her mistake.

She knew she had let her father down. She could not bring herself to meet his eyes.

I felt the blood rush to my face and my ears burnt with embarrassment.

John looked apologetic and embarrassed.

She wanted the earth to open up and swallow her whole.