The Best Art Style for Creating Mystery
A lot can be said without saying much, the same for drawings.
When communicating an idea visually, what you don't show is often just as important as what you show in your images.
By adding just enough detail to give your audience a general idea of what you mean, instead of providing a highly polished presentation, you allow them to fill in the gaps and interpret the story in their own way. This approach can effectively leave things feeling "unfinished," but in reality, it may be more beneficial than a fully polished, real-time, interactive, PBR-rendered, AI-augmented version of the subject.
A lot can be done without doing much. Horror games can benefit from leaving areas in the dark, to make the player wonder about where the danger would come while saving computer resources; comics and cartoons can leave the brushstrokes loose and rhythmical, to emphasize movement even more; they are a living case study on how painting just enough will communicate things effectively, perhaps even more than a finished picture would, as the audience will have enough room to imagine and fill the gaps of the missing pieces with their own favorite interpretation of what is missing in the composition!
Ink, oil, and other analogue media will benefit most from this, as saving manual labour as well as resources, will come with the consequence of having better and cheaper work.
These are a series of images I've done in my free time that remind me of that concept, and which I've done while keeping that in mind.
Less is more.