Unable to style features in my layer

I have this vector layer

    <!-- OVERLAY WFS LAYER WITH KOMVUS FROM GEOSERVER -->
    wfs_layer_komvoi = new OpenLayers.Layer.Vector("Κόμβοι", {
            styleMap: myStyles,
            strategies: [new OpenLayers.Strategy.BBOX()],
                    protocol: new OpenLayers.Protocol.WFS({
                        version: "1.1.0",
                        url: "http://localhost:8080/geoserver/wfs", 
                        featurePrefix: "rural", //workspace from geoserver
                        featureType: "komvoi_real", //layer name from geoserver
                        featureNS : "http://ift.tt/1t6n1TB", //namespace from geoserver
                        //styles: "point"
            })
        })

And I am trying to add style on the point features but I am facing problems. This is the code I use for the features:

  var myStyles = new OpenLayers.StyleMap({
                    "default": new OpenLayers.Style({

                    fillColor: "#ffcc66",
                    strokeColor: "#ff9933",
                    strokeWidth: 2,
                    graphicZIndex: 1
                }),
                "select": new OpenLayers.Style({
                    fillColor: "#66ccff",
                    strokeColor: "#3399ff",
                    graphicZIndex: 2
                })
    });

What am I missing here?