Create a simple Visualforce page that displays an image

DisplayImage.page

<apex:page showHeader="false">
    <apex:pageBlock >
        <apex:pageBlockSection columns="2">
        	<apex:pageblocksectionitem >
            	{! $User.FirstName } {! $User.LastName } 
           		({! $User.Username })
        	</apex:pageblocksectionitem>
        
    		<apex:pageblocksectionitem >
                <apex:image url="https://developer.salesforce.com/files/salesforce-developer-network-logo.png"/>
        	</apex:pageblocksectionitem>
            
        </apex:pageBlockSection>
    </apex:pageBlock>
</apex:page>