Hiya Tetsumi ^^ thanks for sharing your goodies with us. Alot of your stuff reminds me of my own when I first started out ^^ the more you do-- the more you learn and the more you'll see your work develope-- so hang in there, you're off to a strong start.
For topofraphy stuff, try mixing up your fonts and colors and adjusting the opacity. Don't be afraid to overlap them either. Topography is something you mess with over and over again till you find what fits. It's always the last thing I'll add to a piece because it usually takes me the longest to get right. XD
If you need anythign--- any help or questions, just let us know. We're here to help. ^^