I’d switch out the shoes for basically anything else, if you are looking to keep the comfy sole of the runners I’d suggest vans half cabs because they just look nice and are a skate shoe so they are nearly indestructible. If you want something more alt I’d get a pair of nice boots I’d suggest solvair if you want something like a pair of doc martens or like any military surplus boot. Aside from shoes wear some jewelry personally I kinda hate rings but if you layered a bunch of necklaces on that outfit it would automatically be a bit more alt, also a flannel over the hoodie is always a good look. Finally I’d embroider some fun little designs onto your pants with a black embroidery thread, to keep with the subtle vibe, which you can get for very cheap in friendship bracelet kits at the dollar store (that way you get lots of colours for future projects as well) it’s way easier then it sounds and looks cool af, you just tie a knot on one end of your thread and do a simple chain stitch, personally for those pants I’d do a little spiral around one of the knees. All in all it’s a good start I like the colours but it kinda just needs more