Ah, Comanche Peak, thats the name. If i'm not mistaken, this is in the vicinity of The Oasis? along Commanche Trail. Some of the most dramatic scenery is along the peaks and bluffs above the Colorado River valley, which includes Lake Austin and Lake Travis. Also, just a few miles west of San Marcos is the village of Wimberly (very popular 'artsy' destination), which resides in a scenic valley with towering hills on all sides.
Here are some older shots I've taken over the years, including the scenery around Lake Travis (parts of which are in the Austin city limits)
The radio tower in the distance is situated atop the aforementioned Jollyville Plateau (which is the area I grew up).
Cypress Creek arm of Lake Travis (near the village of Volente)
Lake Travis has its ducks in a row (same vantage point as above)
The tall bluffs along the northshore of Lake Travis. This shot is taken from famous Oasis restaurant, which is situated nearly 500 ft above the lake. Speaking of the Oasis, it nearly burned to the ground in June 2005 as the result of a lightning strike. Nearly 85% of the decks and restaurant were destroyed. Amazingly, they reopened a few days later with what was left of their decks. The restaurant is about a month away from its full grand re-opening.
The owner of the Oasis lives in this cliffside mansion, about a quarter mile north of his restaurant.