Yes, BEAMING is a Scrabble word!

Letter values in Scrabble US: B 3, E 1, A 1, M 3, I 1, N 1, G 2.

Is it a valid word?

BEAMING is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

smile radiantly; express joy through one's facial expression
emit light; be bright, as of the sun or a light
express with a beaming face or smile
broadcast over the airwaves, as in radio or television
have a complexion with a strong bright color, such as red or pink
experience a feeling of well-being or happiness, as from good health or an intense emotion