Another Snowy from my files.
For Snowy take-off photos, you should have the wind to your back, because Snowys take off into the wind - even if it means they must fly towards you at first. Once in flight, they will, of course, deviate to avoid you.
Also, for good lighting of the eyes, you should also have the sun directly to your back. This is especially important if you want the eyes well lit.
In this photo, although the sun was at my back, the Snowy looked off slightly to the side as she took off. Therefore, the sun was not directly in her eyes. This is why one eye is 'shadowed'.