The tree branches are outlined by the snow resting on them. The same visual effect can be seen in the traditional Chinese painting with a technique called outlining.
Continue or stop? Proceed or return? Left or right?, etc. There are so many but similar questions. But the key is which answer you pick.
In a brisk winter sunny day, the leafless Sycamore branches create a visual effect that looks like a solid piece of azure glass is cracking.