New Post: SPServices return not working

I created a function using spservices to get the profile picture but when I alert the function it returned undefined. Please help.

$(document).ready(function(){
var getUsername = $().SPServices.SPGetCurrentUser();
alert(getProfPic(getUsername));
});

function getProfPic(username) {

    $().SPServices({
        operation: "GetListItems",
        async: false,
        listName: "UserInfo",
        CAMLViewFields: "<ViewFields><FieldRef Name='ID'/><FieldRef Name='Account'/><FieldRef Name='Picture'/><FieldRef Name='Name'/></ViewFields>",
        CAMLQuery: "<Query><Where><Eq><FieldRef Name='Name'/><Value Type='Text'>" + username + "</Value></Eq></Where></Query>",
        completefunc: function (xData, Status) {
            $(xData.responseXML).SPFilterNode("z:row").each(function () {
                var p = ($(this).attr("ows_Picture")).split(",")[1];
                //var a = ($(this).attr("ows_Account"));
                return p;
            });
        }
    });
}