Like some of my custom postings, this one was inspired by another customizer here on FigureRealm. Votomotive Custom Toys posted a simple Beast using the Green Goblin base, using the old Beast head and arms. The paint apps on Votomotive's are amazing, check it out.
For my Beast I did not have a spare Beast to use for parts so I kept all the original parts and sculpted the head and added fur to various places. The body fur is actually done using a cutting wheel, tapping it to the body to give the appearance of fur. Hopefully it shows through in the pics.
My thanks to Votomotive Custom Toys for the inspiration.