Looking beyond composition, the items you’ve chosen to shoot says a lot about you. Paul Cézanne’s interest in skulls spoke of his fascination with mortality.
Art lessons often begin with renderings of cubes or spheres with one or two sources of light casting shadows that need immortalizing.
Fruit is a reliable example, but you could try books, old electronic hardware, or busts. For painters, it might take days to get these onto canvas. For photographers, it takes minutes.
A still life is simply a collection of items, typically against a plain backdrop.
Vincent van Gogh’s obsession with sunflowers was perhaps best explained in Doctor Who: “I find them complex, always somewhere between living and dying.
Experiment with different lighting. Adjust the proximity of a lamp; how do the shadows change? Which objects are highlighted, and which are hidden? How would the piece look with the lamp as part of the still life?