I struggle with proportions, this is the first one In a while I genuinely think I did alright

That may be helpful for now, but I absolutely recommend either starting with a reference or if you want to train and improve your artistic eye, try drawing it, then take a photo of yourself in the same pose. Then you can compare your drawing proportions to your photo's. Things like that will help a lot more in your ability to grow as an artist and be able to visualize proportions better.

And don't forget that even professional artists are constantly using reference photos!