The examples shown are using the two discussed brushes.
In the photograph with the Gradient background, I used the Color Replacer by first using the magic wand to select an area of blue. Because the blue background has actually different hue in various areas, I had to repeat the action of using the Magic Wand to select and area and then clicked the Icon for Replace all Pixels.
In the next example, I used Change to target but first selecting a rust color. This example took some work to get the colors to only be in the clock. I used a small sized brush as well as using the selection tool to isolate the clock from the rest of the photograph in order to paint closely to the edges.
In the final example of enhancements, I used a number of enhancements. I first reduced the picture to a black and white or greyscale photograph and then increased the colors back to 16M colors.
Each of the various enhancements were done on a duplicated layer so that I could return to a previous enhancement and start again. Again I isolated the Clock, Clock face and Clock hands as selections so that I could work on each without affecting the other.
I added a texture to the clock, embossed the clock hands and then used an Inner Bevel to give the hands some dimension. I also ultimately used the Change to Target to color the clock face.
I also used the Change to Target to color the tree leaves on the left, then used the Burn Tool to darken them and then the Sharpen tool to sharpen them.
Finally, after isolating the Clock and the enhanced trees with a selection, I blurred the rest of the background to create an effect of the clock being definitely in the foreground..