Michelle Castillo presented 20 tips for making a WordPress website look professional. She recommends using themes like Genesis, Divi, or Thrive Themes which have many options. Basic practices include removing the meta block and customizing the footer copyright. Colors are important for the design and she provides resources for color schemes. Images can be taken or purchased from stock sites, and free sources like Unsplash are also mentioned. Tools for editing images include Gimp, Photoshop, and SumoPaint. Getting help with images can be found on sites like UpWork by posting job descriptions.