I gotta say, I love the shading in this! The use of hue shading and the darker shadow on the bottom half of the drawing. One of the issues that does stick out is, heh, the tounge! I just might have added a bit more shading or line around the tongue to help stick it out a bit more as it kind of melds into the lip. The only other issue is more of an uncomfortable extreme that I see. With the chest the slip looks like it's VERY low to a point where if the drawing was fully rendered to be realistic, I wouldn't be reviewing this because it would be rated A, if you catch my drift. Otherwise, everything looks awesome! I really dig how you use channel shifting to your advantage! If you have any questions or are confused on anything I said, feel free to PM me!