Photoshop tutorial. (Bush)

Black&White:
Select what you want to change (magnetic lasso tool). Select image. Click 'black and white' and adjust to preference.

Remove background:
Select the background (magnetic lasso tool). Then delete.

Adjustment layers:
Make the pictures look professional. Add filters. Add a new layer turning the shape in colour as well as the picture. Then choose what areas of the shape to colour by using the layers. Use levels to make dark areas even darker, and light areas lighter.