To resize an image, choose "Resize Image" from the "Edit" menu. You can also click the size text at the bottom of the Picturesque window. The resize pane (shown above) will allow you to modify the original image's dimensions. You can use the slider to scale the image down quickly by a certain percentage.
Picturesque always maintains proportions, so if you enter in a value for width, Picturesque will calculate the height automatically and vice versa.
When you add effects the final image size will change. For instance, if you add a reflection, the height of the final image will be much larger than that of the original. Picturesque calculates the final size for your image automatically and displays it in the resize sheet and at the bottom of your window.
When you are done editing a single image, you can save it using one of 3 different save commands: