I have many pencils, with many hardnesses, and I use quite a few different leads for different parts or stages of a drawing. I mostly prefer a harder lead for getting the basic ideas right, then going over that with a softer lead for most of the sketching. I've found that working with a softer lead as well as nicer paper can make my drawings look more pro, since before I started the art class I'm currently taking I mostly drew with very hard leads and drew on mostly just printer paper. The result was more, often than not, scratchy and ugly, especially when scanned into Photoshop and had the levels turned up. But not anymore, my art class is really teaching me a lot about how to make good art.
Oh, so looking at reference pictures IS a good thing? I've heard good things and bad things about it, but I thought it was bad because I heard that any good concept artist needs to draw stuff from straight out of his ideas and nothing else, and that using a reference picture is just "copying," and almost as bad as tracing or using a base. It just gets so discouraging sometimes, but I'm glad I'm getting better slowly but surely.
Anime and manga, you say? I used to draw in that style up until about a year or so ago when I decided to try my own more realistic style instead. You can still see my older, anime-style drawings in my folder called "Old Stuff - Animu and Mango." It's a good style for a beginner, but I'm not really that into drawing like that anymore. I guess that's sort of sad though, since one of my best friends loves my anime drawings, back when I used to draw them. Maybe I should draw like that again, if not just for him.