Not a bad routine. The one thing you're not really hitting is the hamstrings. They are hit a little on lunges, but not enough if you want to build any muscle. Try some strait leg deadlifts and/or leg curls.
Biceps curls, tricep extensions, and lateral raises are isolations. Not that they are bad exercises.
One thing to keep in mind is that the large muscle groups such as lats, pecs and quads take more than one exercise to really get hit hard. Try adding in some other exercises such as barbell rows for back, DB presses for chest.
And if you're looking ot build a little muscle you would have better luck lifting heavier weights for fewer reps. Try increasing the weights you use so that you can't do more than 10 reps. Then increase again.
Also, keep changing up the exercises that you do. If you do the same exercises week after week your body may become too accustomed to them. A variety is always good to challenge the body.
Hope that helps!
Sarah