Start by preheating your oven to 180°C (350°F). In a large mixing bowl, combine **300 grams of all-purpose flour**, **200 grams of sugar**, **1 tablespoon of baking powder**, and **1 teaspoon of salt**. Mix these dry ingredients thoroughly until they are well incorporated.

In another bowl, whisk together **240 milliliters of milk**, **120 milliliters of vegetable oil**, and **3 large eggs** until smooth. Gradually pour this mixture into the dry ingredients, stirring until just combined. Make sure not to overmix to ensure a tender cake.

Pour the batter into a greased cake pan and spread it evenly. Place the pan in the preheated oven and bake for about **30 to 35 minutes** or until a toothpick inserted into the center comes out clean. Once done, remove the cake from the oven and allow it to cool in the pan for **10 minutes** before transferring it to a wire rack to cool completely.

To apply the paint later, it is crucial that the cake is **very cold**. Once your cake is completely cool, refrigerate it for at least **1 hour**. This will help the decoration process go smoothly.

In a mixing bowl, combine **200 grams of white powdered food coloring** with **240 milliliters of water or vodka** to achieve your desired paint consistency. Stir well to make sure there are no lumps, and the mixture is smooth. Feel free to adjust the liquid quantity for your ideal thickness.

Once your cake is chilled and the paint is ready, it's time to get artistic! With a clean brush, carefully paint over the surface of the cake. Use your imagination and let the design flow. Remember that it doesn’t have to be perfect—every stroke adds character to your cake!