Hair always looks bad and i'm trying to grow it shoulder length?

Well, I'm a male TRYING to grow my hair shoulder length, and to be perfectly honest, it isn't working out so well at the moment. I'm finding that it's either a. very dry, or b. very greasy. I rarely have days where it looks full and good.

Actually, well, take that back. Here's what will generally happen. I'll shampoo/condition my hair, and then the next day, it will look, in my opinion, really good (volume, texture, shine, etc). But for some reason, the NEXT day, it will look dull as can be. Should I just be washing it/conditioning it everyday if that's the case? I've heard it's bad for your hair, so i'm kind of on edge about that.

Or, should I just simply condition my hair everyday? The thing is, I've noticed when I condition my hair, it will actually look really nice and full of life, but soon thereafter (the day after) it will look as bad as can be. Should I just condition my hair then instead?

What should I do if my hair looks bad when i'm trying to grow it out? Here is a pic of what it looks like now, parted to the side? (I think). I mean all I want is my hair to look like this

But yeah, how can I make my hair look at least somewhat decent while I'm TRYING to grow it out? It seems like it's taking forever