The background and foreground planting are primarily photographs in .png format taken thru fotosketcher seperatly and consequently have the same all-over texture as the main image.As I work,I normally overlay colour(which are just blobs of colour with a strong gaussian blur filter applied and transparency reduced) over the entire image which helps to integrate the final image.One trick I often do is to take the final finished image in jpeg format thru fotosketcher a second time and overlay this fotosketcher image with the finished photoshop image (normal blend or softlight blend,with a transparency of as little as 15 %).Its all about overlaying layers and playing with the transparency.