Update d3viz documentation in tutorial

doc/tutorial/printing_drawing.txt

@@ -133,11 +133,13 @@ The output file is available at pics/logreg_pydotprint_train.png
 Interactive Graph Visualization
 ===============================
 
-Do you work with complex graphs that can not be represented clearly with
-:func:`theano.printing.pydotprint`, or are you simply looking for a more nifty
-visualization with rich output information? Then Theano's new :mod:`d3viz`
-module is the way to go, which allows you to interactively visualize graphs in
-your web browser, including zooming, drag-and-drop, editing node labels, or
-coloring nodes by their compute time!
+The new :mod:`d3viz` module complements :func:`theano.printing.pydotprint` to
+visualize complex graph structures. Instead of creating a static image, it
+generates an HTML file, which allows to dynamically inspect graph structures in
+a web browser. Features include zooming, drag-and-drop, editing node labels, or
+coloring nodes by their compute time.
 
 => :mod:`d3viz` <=
+
+.. image:: ./pics/d3viz.png
+   :width: 350 px