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diff --git a/ndlib/viz/mpl/ComparisonViz.py b/ndlib/viz/mpl/ComparisonViz.py
index a65655c..6dff6c9 100644
--- a/ndlib/viz/mpl/ComparisonViz.py
+++ b/ndlib/viz/mpl/ComparisonViz.py
@@ -9,12 +9,12 @@
 import future.utils
 import past
 import six
-
+import itertools
 __author__ = 'Giulio Rossetti'
 __license__ = "BSD-2-Clause"
 __email__ = "giulio.rossetti@gmail.com"
 
-
+marker = itertools.cycle(('D', '+', '>', 'o', '*')) 
 class InitializationException(Exception):
     """Initialization Exception"""
 
@@ -38,7 +38,7 @@ def __init__(self, models, trends, statuses=["Infected"]):
         for model in models:
             srev = {v: k for k, v in future.utils.iteritems(sts[i])}
             self.nnodes = model.graph.number_of_nodes()
-            for cl in srev.values():
+            for cl in list(srev.values()):
                 available_classes[cl] = None
 
             self.srev["%s_%s" % (model.name, i)] = srev
@@ -76,32 +76,34 @@ def plot(self, filename=None, percentile=90):
         :param percentile: The percentile for the trend variance area. Default 90.
 
         """
-
+		
         pres = self.iteration_series(percentile)
-
+		
         mx = 0
         i, h = 0, 0
         for k, l in future.utils.iteritems(pres):
+			
             j = 0
             for st in l:
+			
                 mx = len(l[st][0])
                 if self.normalized:
-                    plt.plot(range(0, mx), l[st][1]/self.nnodes, lw=2,
-                             label="%s - %s" % (k.split("_")[0], st), alpha=0.9, color=cols[h+j])
-                    plt.fill_between(range(0,  mx), l[st][0]/self.nnodes,
-                                     l[st][2]/self.nnodes, alpha=0.2, color=cols[h+j])
+                    plt.plot(list(range(0, mx)), l[st][1]/self.nnodes, lw=2,
+                             label="%s - %s" % (k.split("_")[0], st), alpha=0.9, marker = next(marker), color=cols[h+j])
+                    plt.fill_between(list(range(0,  mx)), l[st][0]/self.nnodes,
+                                     l[st][2]/self.nnodes,alpha=0.2, color=cols[h+j])
                 else:
-                    plt.plot(range(0, mx), l[st][1], lw=2,
-                             label="%s - %s" % (k.split("_")[0], st), alpha=0.9, color=cols[h + j])
-                    plt.fill_between(range(0, mx), l[st][0],
+                    plt.plot(list(range(0, mx)), l[st][1], lw=2,
+                             label="%s - %s" % (k.split("_")[0], st),alpha=0.9, marker = next(marker), color=cols[h + j])
+                    plt.fill_between(list(range(0, mx)), l[st][0],
                                      l[st][2], alpha=0.2, color=cols[h + j])
                 j += 1
             i += 1
             h += 2
 
         plt.grid(axis="y")
-        plt.xlabel("Iterations", fontsize=24)
-        plt.ylabel(self.ylabel, fontsize=24)
+        plt.xlabel("Iterations", fontsize=20)
+        plt.ylabel(self.ylabel, fontsize=20)
         plt.legend(loc="best", fontsize=18)
         plt.xlim((0, mx))
 
diff --git a/ndlib/viz/mpl/DiffusionViz.py b/ndlib/viz/mpl/DiffusionViz.py
index 754f8ac..ab7dd9c 100644
--- a/ndlib/viz/mpl/DiffusionViz.py
+++ b/ndlib/viz/mpl/DiffusionViz.py
@@ -8,12 +8,12 @@
 import matplotlib.pyplot as plt
 import future.utils
 import six
-
+import itertools
 __author__ = 'Giulio Rossetti'
 __license__ = "BSD-2-Clause"
 __email__ = "giulio.rossetti@gmail.com"
 
-
+marker = itertools.cycle(('D', '+', '>', 'o', '*')) 
 @six.add_metaclass(abc.ABCMeta)
 class DiffusionPlot(object):
    # __metaclass__ = abc.ABCMeta
@@ -65,13 +65,13 @@ def plot(self, filename=None, percentile=90, statuses=None):
                 continue
             mx = len(l[0])
             if self.normalized:
-                plt.plot(range(0, mx), l[1]/self.nnodes, lw=2, label=self.srev[k], alpha=0.5)  # , color=cols[i])
-                plt.fill_between(range(0,  mx), l[0]/self.nnodes, l[2]/self.nnodes, alpha=0.2)
-                    #,color=cols[i])
+                plt.plot(list(range(0, mx)), l[1]/self.nnodes, lw=2, label=self.srev[k], alpha=0.5, marker = next(marker),markersize=12, color=cols[i])
+                plt.fill_between(list(range(0,  mx)), l[0]/self.nnodes, l[2]/self.nnodes, alpha="0.2",
+                                 color=cols[i])
             else:
-                plt.plot(range(0, mx), l[1], lw=2, label=self.srev[k], alpha=0.5)  # , color=cols[i])
-                plt.fill_between(range(0, mx), l[0], l[2], alpha=0.2)  # ,color=cols[i])
-
+                plt.plot(list(range(0, mx)), l[1], lw=2, label=self.srev[k], alpha=0.5, marker = next(marker),markersize=12, color=cols[i])
+                plt.fill_between(list(range(0, mx)), l[0], l[2], alpha="0.2",
+                                 color=cols[i])
             i += 1
 
         plt.grid(axis="y")
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