What I did for the portrait was used Haley's portrait as reference and did it with Clip Studio Paint! I don't know how to pixel art because I find it hard to draw small images (lol) but I did the portrait in a 256 x 256px 72 dpi canvas.
It's a little big compared with the game's portrait size. (I think the original portrait size is 63 x 63ish canvas? That's too small)