Dude, don't be so hard on yourself! Even with a tablet, drawing digitally is a bitch! Those images aren't just a good start--they're actually quite advanced. Concentrate more on the content. The drawings can always be marked-up later when you're ready to actually publish them somewhere. I'd say you're off to a great start. Just roll with it and don't worry about how it looks. Only a small handful of us might be able to say they could draw better, so if anyone bashes you they're just razzin' you for the hell of it (as usual).
Great job! Show some more when you're ready!