I have two photos of crowded places. I found them somewhere months ago and I don’t know the author, sorry for that.

I find screencaps that fit, and I cut out the figures. Here they are pretty small, so I simply use the Eraser Tool.

Now I need to make the figures black-and-white. I think Gradient Map makes it look brighter than simple Desaturation. Image>Adjustments>Gradient Map,  the black-to-white gradient.

I place John and Sherlock into the crowd choosing the best position, so that they are a real part of the mass in the photo.

I want John to look at the opposite direction -  Image>Rotate Canvas>Flip Canvas Horizontal.

To make an effect of motion I Duplicate layers with John and Sherlock 3-4 times. I leave one copy of each group untouched and place it above others. Now just have some fun with those copies and Blur. Filters>Blur>…

Here are two different settings of Motion Blur I used for two of Sherlock layers.

Then I use some Radial Blur, adjust Opacity and erase what I don’t want in each layer. Feel free to experiment!    

 I add some color to Sherlock’s scarf, Watson’s jacket and footwear. I create a new layer and paint the area of scarf in blue with a Brush Tool. Then set the Layer blend mode > Lighten and adjust Opacity. Repeat similar manipulations for John’s figure.

I have to circle the figures with kind of “red marker”. I used ArtRage to paint the circles just because it perfectly imitates real brushes and materials.

I add this circles to my work and set the Layer blend mode >Multiply.

I finish my work by applying a texture

and Image>Adjustments>Levels for Sherlock’s image 

Finally: