/ic/ - Artwork/Critique

I'm a beginner that just got a new drawing tablet and it feels great compared to on paper, mainly because I can look up at a screen instead of having to crane my neck and back to look at my sketchbook. (I'm 6'5 my desk is barely 3 ft high.) But I'm afraid that I'm starting bad habits with it, mainly because whenever I draw lines normally they end up very scratchy and messy, and with the tablet I can just erase the rough parts and make them look better. Pic related is the first thing I've made on it, just something simple to try it out, bottom pic is before I erase everything and top is after. I feel like this might be detrimental to me, since I should learn how to draw better lines instead of relying on the erase tool to make everything look better.

Is this something I should be worrying about or not? Also what are some things I can practice to generally make my lines less messy?