This is alleged to be in Ireland. Yet, the mountains seem far too steep. One comes across such things on Pinterest where they spread like wildfire.
Reverse image search (TinEye, oldest match) shows several travel sites linked to Ireland. Someone then cropped it for vertical and now it’s all over Pinterest.
The pin I found says it’s the Mourne Mountains, from Lonely Planet.
Some photos from Scotland look more craggy, but still not like the mystery photo. From Wikipedia.
It looks unreal, as if it was generated by a computer program. Notice how snow carefully fades, as if it were created by an algorithm.