Draft emails in Gmail from a Google spreadsheet https://katydecorah.com/code/google-sheets-to-gmail/

script.js

var EMAIL_DRAFTED = "EMAIL DRAFTED";

function draftMyEmails() {
  var sheet = SpreadsheetApp.getActiveSheet(); // Use data from the active sheet
  var startRow = 2;                            // First row of data to process
  var numRows = sheet.getLastRow() - 1;        // Number of rows to process
  var lastColumn = sheet.getLastColumn();      // Last column
  var dataRange = sheet.getRange(startRow, 1, numRows, lastColumn) // Fetch the data range of the active sheet
  var data = dataRange.getValues();            // Fetch values for each row in the range
  
  // Work through each row in the spreadsheet
  for (var i = 0; i < data.length; ++i) {
    var row = data[i];  
    // Assign each row a variable
    var clientName = row[0];                // Col A: Client name
    var clientEmail = row[1];               // Col B: Client email
    var veg = row[2];                       // Col C: Vegetable name
    var vegDesc = row[3];                   // Col D: Vegetable description
    var emailStatus = row[lastColumn - 1];  // Col E: Email Status
    
    // Prevent from drafing duplicates and from drafting emails without a recipient
    if (emailStatus !== EMAIL_DRAFTED && clientEmail) {  
    
      // Build the email message
      var emailBody =  '<p>Hi ' + clientName + ',<p>';
          emailBody += '<p>We are pleased to match you with your vegetable: <strong>' + veg + '</strong><p>';
          emailBody += '<h2>About ' + veg + '</h2>';
          emailBody += '<p>' + vegDesc + '</p>';
          emailBody += '<p>' + clientName + ', we hope that you and ' + veg + ' have a wonderful relationship.<p>';
          
      
      // Create the email draft
      GmailApp.createDraft(
        clientEmail,            // Recipient
        'Meet your vegetable',  // Subject
        '',                     // Body (plain text)
        {
        htmlBody: emailBody    // Options: Body (HTML)
        }
      );
      
      sheet.getRange(startRow + i, lastColumn).setValue(EMAIL_DRAFTED); // Update the last column with "EMAIL_DRAFTED"
      SpreadsheetApp.flush(); // Make sure the last cell is updated right away
    }
  }
}

How would you go about adding a signature with an image to the bottom of an email? Image part is what i'm struggling with. I've tried and few different things and can't seem to get it nailed down. Love this by the way. So useful! Thank you!