You can add left padding to the left sidebar or you can add a left margin to the class of widget in the left sidebar. You would add something like the following in ATO>Add HTML/CSS Inserts>CSS Inserts
HTML Code:
td#left div.widget { margin-left: 20px;}
You will then have to resize your image to fit in the now smaller sidebar or increase the width of the sidebar to compensate. You will probably also want to add some left and right padding to the center column (td#middle)