What species of fox is this?
This is a white morph red fox, not an arctic fox.

As noted in the question, this fox has larger, more pointy ears than an arctic fox, and the second picture shows it to have a longer muzzle as well.

Another clue is that these pictures were taken in the springtime or early summer (which you can tell from the new growth on the plants in the picture), and that arctic foxes are only completely white during the winter. During the spring, an arctic fox should look like this:



You can also easily tell that the fox in the picture is not an albino, because of the dark pigment in the nose and eyes.

The red fox has quite a few different color morphs, and this fox looks to be a white color morph.



In that diagram, this fox would be labelled as leucistic (white).

Here are some other white morph red foxes: