Your pictures look like the Southern part of the lake where I fish each year.
I got back from my annual sabbatical to Mask last week having fished the lake for 7 days solid. I released about 10 trout and kept just one. It was very disappointing this year as despite the weather being reasonable albeit with a touch of an East wind most of the time, the fish never really took to the hatch of Mayfly. We had one 2 hour session where "anything went" and I landed 6 trout in that window. Other than that despite 10 hour days on the lake we had three complete blanks!
That said, fishing is just half the story when it comes to Lough Mask. The scenery is breath taking and nothing beats the cup of tea from the Kelly Kettle! The pint in Burkes in Clonbur isn't bad either....
Roll on next year.
Some photos to add to the thread which I hope have been resized...