This intricate pencil sketch depicts a Space Marine, a member of the Deathwatch judging by his ornate armor and purity seals, facing off against a monstrous Tyranid creature. The Marine stands resolute, holding a bolter aloft and clad in detailed power armor adorned with skull motifs, Aquilas, and numerous inscriptions that signify devotion and duty. His calm expression contrasts with the ferocity of the Tyranid, whose menacing form looms above with razor-sharp claws and a gaping maw. In the background, a battlefield unfolds, with swarms of Tyranids crawling across a scarred landscape littered with spore chimneys and bio-organic structures. The scene captures the grim tension of Warhammer 40,000, where human determination clashes against alien monstrosity.