Hello I am just starting guesture drawing and feel like I am making tremendous emprovement thanks to this site. but I also have a problem with the pencils i use and the fact that I have to use several of them durring one session because they keep wearing out. Today I tried markers out of frusteration and found that It is actually very enjoyable. the dillemma is that any guesture over 1 min. looks like a black blob on the page. I would like to continue with markers, but not like that. should I stick with pencils, or is there any advice or technique that I can use to make it look more clean?