Doxy has lots of mini art tutorials on his site http://prismblush.com/tutorials/ and on his youtube channel https://www.youtube.com/channel/UCk_rl9hO9bhPM2IUQFDh8yg/videos

I especially recommend the ones talking about the sketching process and staying loose. Many inexperienced artists tend to skip a lot the rough exploratory phases of drawing to go straight into outlines, which tends to lead to flat and/or bad art in general.