Elementza covers some easy tips on how to work to improve your modeling in 3D.
Just as with anything in life, practice makes perfect, or at the very least, better. Check out this new tips tutorial from Mario Brajdich (Elementza). He covers seven simple things you can do to improve your modeling skills in 3D.
One tip, in particular, is working on smaller portions of the model, and creating a few tests for edge flow polygon work is one that I use all the time.