I have been to 2 or 3 KelbyOne classes and used their online classes plus a two day Photoshop class. Some many ways to use Photoshop even my husband and I use different ways to get the same results.
The Wrong Side of the Fence is using color replacement and Hue/Saturation.
Holding Up, I used two photos, the tree I made most adjustments there then found a photo of a ancient pottery chard we found and photographed. I made a circle on the pottery chard and put into the other photo and made final adjustments.
Sunflower is complied of two photographs, one of the sunflower and the other a piece of ice on the side of the road. It is a good texture photo. The hard part was deciding which layer the ice should be on and which blend mode worked best.