Similarities between Giger's "The Spell III" and "Stillbirth Machine"

leading from

HR Gigers Spell III

and

Stillbirth Machine 

The position of the creature's glass transparent shell on its head along with the division between the horns of The Spell III suggests the general shape of Giger's composition Stillbirth Machine that we can find out was inspired by an Ernst Fuchs composition

Giger's The Spell III as found in Giger's Necronomicon

Stillbirth Machine and The Spell III, side by side comparisons

Still Birth Machine