>>13300269sorry if this comes across as unsolicited advice anon, but push your values. as of now, your clothes and hair are all blending together. i get that you have a colour scheme and you want to stick to it, but it just makes the piece look flat and lackluster. luckily, a good tertiary colour to red and brown is purple, so try introducing that to your shadows. instead of just lowering brightness when shading, shift the hue as well to a cooler tone. sure, some of my correction may be down to personal preference, but just here to help huhu.
original left, my version on the right, greyscale so you can see how shading with contrast in mind makes the silhouette of the character really 'pop' and not look as flat.