The title mentions Pothole (Dome?), but the official Glen Aulin trail doesn't go near Pothole Dome... I'm assuming you're referring to the unofficial use trail that follows the south side of the Tuolumne, from Pothole Dome to the bridges where the official trail crosses to the south. (The official trail stays far from the river in the forest for the first few miles...)
There is one set of cascades when this trail first meets the river, maybe 20 or so minutes from the Pothole Dome parking lot (or
fifteen hours from White Wolf ). Past this set is a large meadow, then a narrow stretch that could cause lighting challenges at sunset (the river might be in shadows). The next set of cascades that would be good for sunset photography is probably between the bridges and Glen Aulin--but that's 3-4 miles or so from the parking lot.