I find the best designs blend astrology symbols with something personal. Start with the classic glyph (the archer's arrow/line) as your anchor — it's simple, instantly readable, and can be stylized masculine with thick strokes or geometric breaks. Pair that with a centaur silhouette or a minimalist archer to give it narrative weight; a small centaur tucked toward the back of the shoulder looks epic when the arm moves. I like combining the glyph with the Sagittarius constellation as a dotted-line wrap that follows the shoulder curve, so the stars peek onto the deltoid.
For a bolder vibe, think bow-and-arrow motifs with sweeping lines that follow muscle flow, or a Jupiter symbol subtly worked into the background for ruling-planet energy. Play with styles: blackwork for stark contrast, neo-traditional for color and shading, or fine-line and dotwork for a refined look. Color-wise, deep indigo, burnt orange, and golden accents sell the fire-mutability energy. Size-wise, keep it large enough to breathe on the shoulder cap but use negative space so it reads from a distance — I love how those combos feel both personal and striking on a guy's shoulder.