"I'm off to university next month and am trying to learn as many techniques as possible, I'm currently going through the Andrew Loomis books at the moment and was wondering what is your process for drawing heads/bodies/objects/environments, etc?"
Wow, those are kind of a big questions. Well, you can't miss with Loomis. His book Creative Illustration is one of the best sources for information about painting technique, color theory, and composition. Figure Drawing for All It's Worth and Drawing the Head and Hands is also full of valuable information, so it's no wonder they've been classics since the 1940s.
A more recent book that's great for composition, especially if you're interested in film, comics, storyboarding, or animation, is Marcos Mateu-Mestre's Framed Ink: Drawing and Composition for Visual Storytellers. For learning about process and environments, I would just go around your world with a sketchbook.
If you want to learn to draw heads and bodies, and you like learning from videos, check out Stan Prokopenko's YouTube channel. Stan has produced a lot of free videos that break down head and figure drawing into clear and helpful steps.
If you like those, Stan has just released a 5 DVD set of his recent figure drawing series that I can recommend. It's great for beginners or pros who want to brush up on their knowledge. If you prefer streaming content you can purchase premium access to
I don't know if you plan to study art at the university that you're going to, but if so, I would recommend you read the recent editorial "Is De-Skilling Killing Your Arts Education?" on Huffington Post (Thanks, Bryn).
When you get to the college, "kick the tires" before you sign up for any art classes. Go right to the head of the art department as a new freshman and tell them about the kind of art you really like (Loomis, Rockwell, Bugs Bunny or whatever it is). If they sneer, don't sign up for art there. Use your college time to study English, science, history, and other subjects, which will enrich you as an artist and a person. Study art through channels that will feed you with the knowledge and skills that you want. (That's what I did, for what it's worth).
Oh, and don't worry about learning as many techniques as possible. You don't need to play all the instruments. Get comfortable with a drawing medium, perhaps charcoal or pencil, and a painting medium, such as acrylic or oil. then try to let technique and style happen naturally as you put your focus on nature.