The sketch will be valued as a piece of art, and any history behind it if any. The name of the artist will help determine the valued. If the Artist is unknown it will most likely have less of a value.
10,000$
1p
$100,00
Paddington bear
a lot
if its a crayon signiture it will be worth $500,000
About $300 depending on the buyer.
To you "PRICLESS"
Head sketch $7,000-$10,000' Full body $15,000 - $20000
If autographed, an authentic card could be worth 150.00 or more.
However much someone is willing to pay for it.
They sell for about 40 dollars.