Build up your skills by capturing starter subjects that are commonly found, such as squirrels or robins. Those are often seen in gardens and therefore accustomed to human presence. These animals are generally more hungry during the winter and easy to attract with some food. With time they will return to the feeding station and you gain more chances to practise.
Documenting their winter behaviour, including food gathering will add an extra layer to the image, which educates and provides context to the viewer. Remember