Sure everyone has to practice, but not all people have the potential to improve equally.

>In a study published in PLoS ONE earlier this year, researchers from the University of Helsinki assessed people's musical creativity based on their ability to judge pitch and time as well as skills such as composing, improvisation and arranging. They found that the presence of one particular cluster of genes correlated with musical creativity. Crucially, this cluster belongs to a gene family known to be involved in the plasticity of the brain: its ability to reorganise itself by breaking and forming new connections between cells.
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>​ “Being artistic or creative is associated with the personality trait of being open to experiences,” Garrison says. “Some research suggests that there are neurobiological foundations for creative individuals. Based on all available information, it is very likely that the capacity for creativity is shaped by genetic influences –– it’s a complicated way of saying that creativity and artistic interests can almost certainly be inherited.”
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>"The people who are better at drawing really seem to have more developed structures in regions of the brain that control for fine motor performance and what we call procedural memory," she explained.