Youre experimenting!! Thats actually really really good
My advice would be to push the tone/contrast a lot more on the shading, like you got rid of the outline, so you gotta make up for it by giving a deep shade around the edges, but not all around it, just the places where a shadow would be, like under the hair
Oh gosh I wish I could help you a better way than explaining it in text, eh well
Great job you should keep experimenting