1. Background layer: straighten, crop, remove toys and other clutter with clone tool, USM: amount 17%, radius 210 pixels, threshold 0
2. PseudoIR: ED109, IR 128; Overlay 48%; erase layer under arch
3. Chalk Sketch: Colorful (modified)--Brush Size 100%, Coverage 100%, Pressure 124; Luminosity 39%
4. Background Copy: Normal 49%; erase layer over the stonework
5. Paint: Fine Brush Hairs (modified)--Brush Size 75%, Coverage 99%, Pressure 80; Screen 47%
flatten layers, resize

A slightly different view of the same scene with minimal processing can be seen here: http://www.pbase.com/malewis/image/43578025