This illustration is my interpretation of a scene described to me while playing D&D's Lost Mines of Phandelver campaign. This illustration was made on the third of October, 2018 using SketchBook Pro.
Final work with refined lighting
Planning basic lighting of the scene
Blockouts of the tower and dragon, reshaped the canvas to a more appropriate size
Adding a sketch of the tower and foreground
Changed the colour to make a more dramatic looking sky
Defining background and clouds
GIF of the progress