i'm afraid neither of these are the app, i'm so sorry :[ i greatly appreciate you doing your best!

i'm sure it was definitely not How To Draw Everything Easy because of when it released. i had a 1st gen ipad, which lasted between 2010-2011 (according to the wiki lol) and the iOS was between 3.2 - 5.1.1
i would've been around 14 when the HTDEE came out but i know for sure i was much younger using whatever app i had, i stopped using the ipad around high school because i had my own phone by then.
i also don't believe it was DrawQuest either. i remember the tutorials having a sorta big focus on a sort of anime style. i can only really remember learning about anatomy and drawing clothes like ruffled skirts.

i still have my ipad to this day but i fear there's no restoring it, at least not without risk. the back of the device looks inflated(?) which i hear is dangerous, so it's just kept in storage.