Thank you all so much for the suggestions! If anyone has any more, feel free to chime in!
Sibelius wrote many wonderful piano works, the vast majority of which are frequently ignored in favour of his orchestral works. His Sonata Op 12 is particularly special. Dvorak also wrote some great pieces, e.g. the Humoresques Op 101.
My Finnish grandmother would have loved to hear me play Sibelius, although, she loved to hear me play anything! I've just recently realized how much of a gift it was that she was into music. She got my dad into music, and he got me into it. I wish I would have thought to thank her. Well, I guess that's neither here nor there

I'll look into it. Thanks!
Lieder ohne Worte by Mendelssohn? There are more than 40 of them with varied difficulty. At least some of them should appeal to you.
I was thinking about getting these. Do you have any in particular that you recommend?
i love works by Josef Suk, there's a sweetness, a tender quality to many of the 'slower'lyrical ones that just draws me in....
Very pretty, thank you for the suggestion.
I don't know if there a Henle of it, but you can find a good version of this and all of them on IMSLP. Leo Orstein, he was a modern composer. He's thought of as a crazy avant garde that makes Schoenberg look like Mozart, but it's just not true. Has so many beautiful pieces.
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You also might like Federico Mompou. He was an impressionist from the 20th century. His pieces are a little simpler on the surface, but very deep.
I like the Mompou, but the Ornstein...I think I'm in love! Thank you so much for the suggestion. Although, I'm having a bit of trouble finding much of his stuff on SheetMusicPlus, where I buy most of my music. Where can I buy his music, and do you have a recommended publisher? I know I can just find it on IMSLP but a printed edition is so much nicer. Thanks!
There are many great piano pieces composed by Albeniz.
Last time I checked there was no henle edition of any of his works, but you might like some of Enrique Granados' pieces
I have a huge disposition towards trying one or both of these guys because they're Spanish and I like Spain. I will look into both of them. Thanks!
CARL VINE!!!!!
Dude, like there is not enough atoms in all of the atoms in 10^80 universes to express how much you will enjoy Carl Vine.
But if you don't like him, then try Arno Babajanian
Well, I was going to look up Babajanian, but I like Vine, so I guess I can't

Ravel-Miroirs and Le tombeau de Couperin Suites, and Jeux D'eau
Schubert-Impromptus Op.90 and Op.143, Moments Musicaux Op.94 (especially No.3), and Wanderer Fantasy
Dvorak-Humoresques Op.101 and Poetic Tone Pictures Op.85
Mussorgsky-Pictures at an Exhibition
Schumann-Carnaval Op.9, Fantasiestucke Op.12, Abegg Variations Op.1, Papillions Op.2, Toccata Op.7, Kinderszenen Op.15, Three Romances Op.28, and Waldszenen Op.82
My teacher recommended Schubert's impromptus and Schumann's Carnaval, Fantasiestucke, and Papillons to me as well, so I guess I kinda have to get one of them now, don't I? Thank you also for the other suggestions.
If you haven't played any Schubert you simply must fix that now!
Okay okay okay! Finnnne! Any suggestions? I'm already thinking about the impromptus.