The character design is cute, but
the big wizard hat is impractical for fellatio scenes. It's going to stab into her partner's torso during normal gameplay.
Options:
- ignore the problem; use the design as-is
- find a fanart image which omits the hat (example); use it as the reference for the mod
- twist the hat counterclockwise (and/or shrink it) so that collision is less likely to occur
Your reference image is very good (by SDT request standards) but I can nitpick about a few things: the leftmost section has been cropped off (not really important), the hair detail is low (perhaps because it's an action shot?), and the body pose obscures some details around the girl's neck. By contrast,
this image isn't an ideal reference
(gradients shading requires more modding work, and it clashes with the SDT art style) but it establishes a more complex hair shape and also provides a clear view of the neck and jawline. It may be useful to seek out a few
supplementary reference shots, so that modders gain a better idea of how the character might fit into SDT.
By the way - it's typical to include the
name of the source material (e.g. videogame, anime series, webcomic, artbook, etc). Doing so ensures that your thread can be found by someone who is searching for similar material, and can be useful to modders if they need to find additional reference images. I've attached a few tags; feel free to adjust them if they're inaccurate.