Drawing is regular craft. You have to learn technique and train eyes. By training you get better and better. When you skip training for couple of months, you loose some part of your skills. If you are interested take a look at my sketches. I owe a lot to my teacher Aleš Chalupa.
One of the most difficult drawing discipline is portrait drawing. It's my most favorite one. In case you are also drawing portraits and you want to know if it looks like a human I have one tip for you. Simply try to upload your result on Facebook. If Facebook ask you to mark person on uploaded photo you achieved important milestone. :-) It's important milestone, but there is another one. The result should look like person you are drawing.
I prefer to draw with Faber-Castell pencils. The biggest advantage — compared to common pencils — are drop resistance and graphite homogeneity. I use also combination of pencil and marker from time to time. Full, vivid, black marker color is just amazing.