I am trying to pull picklist values in to my component using schema and its methods. I am getting all the values through server controller, but in my component labels are not populating but it is showing picklist structure.

Lightning Component:

<aura:component controller="PickListController" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
    <aura:attribute name="aname" type="Account" default="{'sObjectType':'Account'}"/>
    <aura:attribute name="picvalue" type="List"/>
   <aura:handler name="init" value="{!this}" action="{!c.doInit}" /> 
        <lightning:input label="Enter Your Name: " value="{!v.aname.Name}"/>
        <lightning:input label="Phone Number: " value="{!v.aname.Phone}"/>
       <lightning:select value="{!v.aname.Rating}" label="Rating">       
            <option value="choose">Choose one...</option> 
            <aura:iteration items="{!v.picvalue}" var="s">
                <option value="{!s.value}"/>             
            </aura:iteration> 
        </lightning:select> 
    <lightning:button label="Submit" onclick="{!c.go}"/>
</aura:component>

Js:

({
    doInit : function(component) {        
        var pickvar = component.get("c.getPickListValuesIntoList");
        pickvar.setCallback(this, function(response) {
            var state = response.getState();
            if(state === 'SUCCESS'){
                var list = response.getReturnValue();
                component.set("v.picvalue", list);
            }
            else if(state === 'ERROR'){
                //var list = response.getReturnValue();
                //component.set("v.picvalue", list);
                alert('ERROR OCCURED.');
            }
        })
        $A.enqueueAction(pickvar);
    },
    go : function(component){
        var cvar = component.get("v.aname");
        var action = component.get("c.insertValues");
        action.setParams({acc: cvar});
        action.setCallback(this, function(response) {
            var state = response.getState();
            if(state === 'SUCCESS'){
            var list1 = response.getReturnValue();
            //component.set("v.picklistValues", list);
            alert('Record Created Successfully '+list1);
            }
            else if(state === 'INCOMPLETE'){
                alert('Something is missing');   
            }
            else if(state === 'ERROR'){
                alert('Insertion Failed');   
            }
        })
        $A.enqueueAction(action);
    }
})

Server Controller:

public class PickListController {
    @AuraEnabled        
    public static List<String> getPickListValuesIntoList(){
        List<String> pickListValuesList = new List<String>();
        Schema.DescribeFieldResult fieldResult = Account.Rating.getDescribe();
        List<Schema.PicklistEntry> ple = fieldResult.getPicklistValues();
        for( Schema.PicklistEntry pickListVal : ple){
            pickListValuesList.add(pickListVal.getLabel());
            System.debug('Values in Rating are: '+pickListValuesList);
        }     
        return pickListValuesList;
    }
    @AuraEnabled        
    public static Id insertValues(Account acc){
        insert acc;   
        return acc.id;
    }
}