cool ! I did a Beethoven inspired sculpt last year and it was a LOT of fun.
I didn`t into sculpting the hair too much, something I should revive again (:
If you go for a likeness it seems your eyes are too thin and wide.
The nose, mouth, chin ratio seems a bit off, making the lower half of the face seem long.
It also feels like the cheeks and chin volumes are too bulky but that could be related to the proportions.
There are a lot of different Beethoven paintings, sculpts out there ...I used these as my main reference ... your reference may vary (:
The first one is a painting by Stieler I believe, the second one I don`t know about the artist.