This one is pretty straight forward. You only have one clue here, the pictures of the dragons. Each portrait will give you one letter of the 5-letter code that you need. The numbers on the portraits give you the order that your 5 letters need to go in.
Your hint here is "If you want the Dragons to invest, you ought to be on first name terms." The first letter of the first names of each Dragon is your code.
This answer should be in all capitals with no spaces.