Is my "horror" story for english good? Do you have any suggestions?

Where is the horror? It is very well written but not scary enough. Family members should at least be horribly wounded in a brutal attack if not killed. There should be graphic description of the macre. You should also leave the door open for more writing by having the creature take someone from the family,lets say your mom, with it back to its lair where there is another creatures and their newborn spawn. The spawn then feed on your mother. There needs to be something to induce fear. Right now all we get to hear about is a creature on a rock. What does it look like?Smell like?Sound like? Is it fast or slow? How does it maim? The possibilities are endless. The style of writing is excellent,it is well paced and descriptive. But when do you inject the fear and really put this horror story together?