Thank you for keeping us updated!
No pressure, though; you have already offered us a wonderful gift - free art of our favorite comic! You don't owe us anything at all. We'll be pleased to see your next sketches, of course, but we can wait and understand if you want to stop at any point.
Also, through a written medium it's hard to tell the difference between a light joke and self-belittlement, so maybe my encouragement is not needed or akward, but: your drawings are not dumb scribbles. You drew high-quality fanart that all of us posting here enjoyed, and probably lots of people who didn't reply. It took talent, dedication (I hope rendering those rocks is not too much of a sore subject) and a genuine love for the comic. Please don't dismiss your efforts.