I posted a hybrid titmouse from this same location and date at:
I saw birds that ranged from visually perfect Black-crested Titmpuse like this one, with complete black crests and pale rusty/buffy patches over the bill, to birds with pale gray crests like a typical Tufted, but with dark rufous (not black like Tufted) patches over the bill. I *think* the bird here is a pretty typical Black-crested, but the hybrids certainly get confusing. If this bird had a darker chestnut/rufous patch over the bill I'd be more hesitant about calling it Black-crested.
The titmice in a narrow swath of central Texas are very interesting as they are hybrids or interbreeds between Black-crested and Tufted. I posted some info from a titmouse at this same location a week or so ago at:
and today I had occasion to be there so I took a few photos. There appeared to be several probably Black-crested Titmice which I will post separately, but also a number of birds with mostly gray crests but dark rufous patches above the bill which appear to be one of the hybrid types. Three images posted.
Brief description of what you observed
Baeolophus is a genus of bird, commonly known as titmice in the Paridae family, all of which are native to North America. In the past, most authorities retained Baeolophus as a subgenus within the genus Parus, but treatment as a distinct genus, initiated by the American Ornithologists Union, is now widely accepted.