My diet consists mainly of tuna, chicken breast, whole weat bread, cottage cheese, oats, milk, vegetables and eggs.

That's mostly it, I need to expand on it though,

I'm also drinking a Whey shake after excercising and in the morning. (Looking into getting some creatine, too)

My lifting experience is literally like 6 months, where I've been pretty much doing the routine I posted above, with little
Tweaks here and there. Its been working pretty good, I've cut down on fat, and I've seen more muscle definition but not a lot of growth. (Think of a swimmer's body, more or less)
I'm looking to gain some muscle, get bigger and harder.

Right now I'm 5'9" , weighing at 142 lbs.
As you can see, pretty skinny, but my muscles are getting pretty defined. I wanna take this up a notch and build more muscle. Especially in my arms, (which are still pretty skinny) and my chest.

I think I'll post a picture soon. Thanks