Gosh, I've been gone a while. And here I thought I would have some free time over the summer.  
 
 Anyway, to answer your question, I would say, "Yes." It's fine to use more than one technique in describing things, especially as you keep the pacing of the story in mind. The establishing shot technique is fine if you are not in a fast paced section of the story, but if you are escalating the pace, I'd use the peppering technique for a couple reasons. One, you don't want to bring the story momentum to a screeching halt so you can take the time to expound upon every spot on the underbelly of the vicious
 harwutzle bearing down on your hero, and two, your POV character probably wouldn't have the time to take in the details in a rushed moment. In the interest of having a strong voice when it comes to revealing your POV character, what you describe when is important.
So I'd say the two techniques apply to places, creatures, people and anything else you want your reader to get the feel for. And when you do write that description, don't forget other senses. The smell of some creatures is even more memorable than how they look! Or perhaps the creaking sound of a giant scorpion's massive exoskeleton is just the sensory experience you need. I'm sure you see what I mean. I better quit before I write a novella here.