close-up of two hands of a male worker, visible wear and calluses from hard work

39aph39 adult arm authenticity calloused calluses closeup concept craftsmanship dedication detail detailed determined effort ethic finger fingers focus gesture gritty hand hands hard hardworking industrial labor laborer leg limb male man manual nail occupational perseverance physical realism resilience rough rugged scratches skilled skin strength strong texture tough two visible wear weathered work worker working