First and foremost, thank you everyone for helping put a neurotic fresher's mind at ease! I don't feel anywhere near as terrified now, so, with that said, here is today's batch of sketches. Also, apologies for the haphazard numbering, I'm left-handed so I work across the page right-to-left (most of the time - other times I just go all over the page).
I went back to creatures to try out some of the suggestions I was given - I'm a very one-thing-at-a-time sort, and when I try new techniques it helps to have something familiar to attach them too. Probably the most successful example of the overlaying technique is #1, even though I have no idea what it is.
As well as a couple of oddities I began playing with silhouettes - they were definitely very helpful, and incredibly quick to do! I found I didn't have to worry about which bits were what and instead just tried to make interesting shapes. The conjoined legs on #8 were actually from a shar pei dog (the ones with far too much skin) I saw while drawing it, and I really liked the way the skin flopped everywhere, so I went with it.
And two more, for luck. I really like the head-shape of #12, it's like it can't decide if it wants to be a reptile or an insect. #13 contains about half a dozen indvidual shapes but you can't really tell - I'm not sure if this is a good thing in that it gives a sense of cohesion to the silhouette, or a bad thing in that it feels to homogenous.