For real you have glorious hair. Like take one big handful of it... that's more than all the hair on my head combined.

There's a lot of potential there.

I also part my hair in the middle by nature, with it falling equally on both sides. I found that I can achieve some really interesting, different looks by side parting, and optionally pinning back the side. Kind of a variation on an "undercut" but I don't really wanna shave off my hair! Braiding seems to be the "trendy" way to do this, but idk how to braid my hair yet.

You could get some hair ties and experiment with pony tail(s) and partitioning your hair in interesting ways. The way I look at this, there are no rules actually when it comes to your style. How people create new trends is just that, breaking existing rules. Goth can overlap with many other styles, western, punk, cyber, industrial, even pastel goths are a thing!

I think the main difference between your selfies is in #1 you are looking down at the camera, in #2 you are looking up. Perspective difference changes the perceived shape of your face. I'm exactly the same way; my favorite selfies are at an angle from above. In fact that's a super common way to take selfies if you ever notice.

Now, why does that matter?

No seriously lol. Why does it matter how you look in selfies. Honey you wanna be your gorgeous self all the time. Nobody is going to see you as a selfie, except on the internet.

So get yourself a lighted vanity if you don't already have one. Put it somewhere comfortable and take a seat (mine is on the kitchen table). This is how you're going to work on your look.

I have had tremendous success with eyeliner. You want a goth look? Eye makeup is a big key to that. My partner gave me their "pencil" which is actually like a cream or something but in shape of a pencil. This tutorial helped me greatly: https://www.wikihow.com/Apply-Eyeliner

As you can see, there are many different types of eyeliner. You don't need anything super fancy or expensive to start.

The other key part is lipstick, dark colors are kinda standard for goth looks. I got a dark purple which is OK... but I think I'll pick a more neutral color next time.

In fact I got a cheap "all-in-one" makeup set with gel eyeliner, blush, eye shadow and lip tint in it. None of it is great, but perfect for learning technique and finding your best colors! I brought my own brush set, a good set helps.

other basic supplies you need: cotton balls, makeup remover wipes, q-tips.