Below are my notes about the raptors. Don’t read these until you’ve made an attempt to write your own observations.
The raptors gain on the horse in panels 1 and 2. In both these panels the raptors overlap but are also offset. The overlapping shows us they are a pack, but we need the offsetting to be able to see them clearly (otherwise it’d be a tangle of bones). They are coloured a dull green, the colour of mould and decay, to help them seem like enemies.
They run past on either side in panel 3—separated completely now, flanking the horse, but also showing position, just running past. When they go over the cliff in panel 4 the scene becomes pure silhouette, which creates contrast and impact. It also emphasises the action—all other detail is removed, and all we see is the action of going over the cliff.
In panel 5, when the raptors are falling, we have a strong diagonal from the cliff, and the raptors are rotating and twisting, out of control.
The biggest element in the composition in panel 5 is the giant claw in the top right, while Garth and the horse are the smallest element in the opposite top-left corner—emphasising the raptors failure to catch them.