Smaug Size Chart by SyndarilArt on DeviantArt

Glaurung - the father of dragons by Muto_Scapulari -- Fur Affinity [dot] net

Glaurung Size Chart by SyndarilArt on DeviantArt

dragons - What does Tolkien say about Ancalagon's physical appearance, especially his size? - Science Fiction & Fantasy Stack Exchange

Dragons of Middle Earth vs Elder Dragons & Souls Dragons

Glaurung — Gallery Gerard

Creating Glaurung - questions about modifying a miniature

Inside Middle-earth — Dragons, by Alejandro Orradre

ArtStation - Glaurung & Turin

When you find out how big Ancalagon was

The Slaying of Glaurung by Darrell K Sweet (from Tolkien's Silmarillion), in Scruffy McFleabag's Tolkien Art Comic Art Gallery Room