Anderson Art Price Help

[W. R. Logan]

Needs must and next week I'll be putting a page if Anderson artwork up for sale.
It was a gift from John Wagner for work done as I wouldn't take any payment
It's sat in my comic room for years so hasn't been displayed.
It's from Meg 2.37 the Anderson one off Voyage Of The Seeker by Alan Grant and Mark Wilkinson.
It also has the transparent overlay and I was just wondering if any if the art Gurus would have an idea of how much I should pitch it for?

[Tiplodocus]

Can you see any rude bits?

[W. R. Logan]

Yes, does it make it worth more 8-)