Grendel's image

One thing i realized after finishing the first three sections was that my image of Grendel changed throughout each section. In the first section, I didn't really know what to see him as, whether it was a dragon, a monster, or just some phsychopathic maniac who went around killing Danes. In the second section, we got some information that he was a monster who had big monster feet. So I pictured him as a big hairy ogre type monster, but the picture still wasn't clear. Finally, in the third section, we found out that his mother had a tail, so maybe he did too? Also when Beowulf slayed the body of Grendel after defeating his mother, and they were carrying the head back, the poem said it took four men to carry the head. So now I have a clearer picture of what he looked like with his monster feet, his tail, and the big head with some hair ontop since that was what Beowulf carried the head with. I wonder if we'll get even more information on him in the next section or is he totally out of the poem? Did anyone else's pictures change of Grendel throughout the sections?