Mars square Lilith (orb 1.7°) creates concrete friction between the two planets. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Mars in Libra in House 8 brings action, courage, competition, and effort into House 8 (sexuality, shared power, crisis, and invisible bonds), with Libra style (relationship, balance, negotiation, and sense of form); Lilith in Capricorn in House 12 brings pure ideal, absolute demand, fascination, and refusal of compromise into House 12 (retreat, contemplation, long time, and possible confinement), with Capricorn style (structure, ambition, responsibility, and long construction).
Concrete friction: this aspect creates tension between anger, desire, action, impossible ideal, and refusal to yield. Visible angle: Lilith near the Rising sign (orb 3.1°) touches an angle; this aspect is easier to notice through first impression, body language, reflexes, and entry style. House 8 (sexuality, shared power, crisis, and invisible bonds) is in friction with House 12 (retreat, contemplation, long time, and possible confinement); this can create blockage, inhibition, overreaction, or repeated conflict between the two fields.