Beautiful design seldom comes from a single stroke or first draft. It takes iteration upon iteration to arrive at success. The path to creating widely accepted design depends entirely on feedback. No single designer wields a universal sensibility, so each design must be put to the test.
No matter how focused or specific your target audience is, you have no way to inherently know how to approach the look and feel of your creation until you drop your pants and present it.
Put out something ugly first so people can call it ugly and help you define what pretty is. Listen to the criticism carefully and identify the common taste denominator woven throughout your core audience. Without compromising your vision, steer work in that direction. Before long, your audience, you, and your design may find common ground.