Hey, don't know if the creator is here. But I wanted to mention that the art's shading and style are kinda exceptional for this kind of work. But, they could be brought out and enhanced by ensuring the form of the character is precise. Essentially- while it would be a lot of work- by understanding your figure better and perfectly capturing their model/silhouette, it would make all the difference bring out the power of that stellar work and effort that's been spent on developing those illusions of geometric curves as represented here using light and shading.
I really don't think I can avoid coming off as snobbish critical and ungrateful, but I think there's a lot to be gained with additional considerations made to round off the initial anatomy of the model of the characters. One important way would be to developing a model reference sheet for each character, by drawing them at different angles as well as in a 'T' and 'Y' Poses. This helps with keeping the characters on model and making their figure consistent and perfected for "appreciation". Another thing that helps a lot is to consider drawing the same pose several times from different angles, using a digital model reference, paying close attention to the little details. Then doing 2 angles of the final pose with your character's chosen art style as intended rather than as preparation or reference, pay close attention to things about the form that were missed in the other angle, like a pinch of skin, or the location of shadow.
Of course this is time consuming, but maybe doing it once to learn something about forms would be a worthwhile refresher for an evening. My hope is that this gets to the artist involved and in some way helps bring their art to the next level. They've got skin tones, shading, and lighting down in their style, but I can see room for improvement in the figure, proportioning and 3D form.
Just a tip from a artsy perv, have a nice day!
