I'm sorry but my arts are only echi at best.....i need help

can I have some feedback on how to add more depth on skin-tone to make it more...professional?

thank you, all of you have astonishing coloring skills!!!!

When you say ecchi at best does it mean you want to draw hentai eventually? Skin tones are just the skin color but you can use shadows to really emphasize certain parts of the body. I don't mean any offense when I say this but your character looks like a loli or a kid and drawing anything sexual is a bit risky. But if that character is what you enjoy drawing then adding in more shading in certain areas could definitely help.