getting better, getting stronger, I liked the fading colours thoughout the pic, no more blocks of white, you're coming miles in your messy-never-bathe but still looks hot hair. Your suggested improvements are good, but I'd try and switch up the value of your lines, reinforce parts of her silhouette with the strong lines and draw her facial features with softer ones.
If you had curly red hair you'd know that bathing causes the hair to dreadlock immediately. The resulting hair styles are basically by pulling the dreadlocks apart into smaller ones. You don't see hair like this in most woman because they use an extreme amount of chemicals that and most woman with red hair have used dye.