Here's his depiction of the Alamo, as it appeared in 1844...
One thing common to his paintings is the depiction of the background as being open plains, in commonality with the eyewitness descriptions at that time.
Birdwatcher
Looks a whole lot different now, don't it?
I too am curious as to what San Antonio looked like in those days. One of the things I find a bit surprising about Texas is that there are very few building still standing that are much older than 100 years. Quite a change from Wisconsin, where buildings and houses pre-dating the Civil War are fairly common.