The pictographs were astonishing. Tried to read as much literature on the pictographs as available and was surprised at how little there was and how disparate the interpretations. Most bibliography is from 1960's and after with initial exploration in the 1930's. Area definitely merits a return trip. Also, bring plenty of water as the hike is relatively long and you have to treat any water you find in the canyon.
T here are rattlesnakes on the trail that descends to Horseshoe Canyon.
If it has rained, the road to the trailhead might be cross-washed, so be prepared to suddenly stop. See the Jesse Jennings report for the details. There is a narrow where you need to send your pack down ahead of yourself. To photograph the Harvest Scene, plan on being there in the afternoon. The best light is late in the day when the sun is just leaving the panel.