You mean for your drawings? Well firstly, just practice a lot. One of my friends told me(amazing artist) when I was terrible at drawing and I asked her how to draw like her:" how do you draw? You just draw." Best advice ever. I drew every day for 3 years and very often for another year; and you see the results. Secondly: observe. Look at real life and drawings you like, see what techniques could be useful for you. Just try not to copy people; don't worry, you will find your own style. And just be imaginative. It is great exercise to draw what only you invision in your head. That is, frankly what your art is about.