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Focus on intensity. Exercise explosively. Don't plateau. Take it easy between workouts.

Article:
Even if you do all the exercises listed with religious regularity, you're not going to get bigger legs unless you make your workouts as intense as you can stand. In order for muscle to build effectively, you need to break down the fibers and have them build back up stronger and bigger. Doing this requires working out as hard as you can, every time.  For each exercise, use as much weight as you can lift using the correct form for about 10 reps. If you can lift the weight easily for 15 reps, it's too light. If you can't lift it more than 5 times, it's too heavy. As the weeks go on, you'll need to add weight to keep up the intensity. Your muscles will stagnate if you don't lift more as they get stronger and bigger. Doing the exercises quickly and with explosive energy, rather than slowly, builds muscle faster. You'll also be able to do more reps this way. Instead of working out slowly, increase the intensity by going through your sets as quickly as possible. It's important to change up your workout routine every other week so that your muscles don't get so used to doing the same exercises that they stop growing. Keeping your muscles in a state of "shock" will force them to continue the process of breaking down and building back up ever bigger and stronger.  If you do a hard workout that includes squats, leg extensions, and leg curls one week, switch to stiff-legged deadlifts, lying leg curls and squats the next week. Adding weight is another way to keep from plateauing, so make sure you don't stagnate at a weight that's too light. Your muscles need time to rest and repair when you aren't working out. You can keep exercising, but don't do anything that's too strenuous for your legs.  Try swimming, walking, or playing basketball or tennis if you want to work out between leg workouts. Make sure you get plenty of sleep so your body has time to mend.