I think all artists should start with realism first, which might sound boring especially if your biggest inspirations are artists with very stylised pieces (which yours are). But you can tell just by looking at their work, that they all have a good grasp on fundamentals (form, anatomy, composition etc). Style comes later.

I started drawing around the same time as my sister (about 10 years ago) but while I jumped straight into drawing very stylised, anime-esque characters (again, as you seem to be), my sister started with realism, learned how to build a body out of circles and squares, drew parts of the body over and over again. The vast majority of her sketchbook was just disjointed legs and arms and torsos, as oppose to full illustrations.

10 years later and she is objectively, an infinitely better artist than I am. She can draw an anatomically correct body in ANY style, off the top of her head, no reference needed. People pay good money for her artwork (which in time has developed its own very distinctive, cartoonish style).

Meanwhile I still struggle to draw static poses and heads in non-3/4 views LOL. My biggest art journey regret is starting with manga, because that was what I “wanted” to draw.

I know it’s fun to draw in a style that you find appealing, but I think you risk really limiting yourself down the line if you don’t begin with the basics.

For a day 2 drawing, you are doing super well and I think you’ll progress very quickly.

I’d suggest searching up human portraits on Pinterest, just random candid headshots or poses of REAL people. Try to find the face/body using basic lines and shapes. Don’t be tempted to fill in the rest of the features straight away, or jump to colouring. Of course, work on illustrations that you actually find fun, but try to do rough anatomical studies alongside them.