Hi @Madmike,
Thanks for asking your question in the Community!
In order to insert buttons that would appear side-by-side under each picture, I would follow @Mailbox Manny’s awesome advice to add columns to the designated place you want to insert these buttons. Once you click to add to the Add Columns to Email’ option, it will ask you what many columns you want to insert with various options of how those columns can be formatted. You have the option of adding up to four columns to the width of your email. After inserting two columns the same size, you can insert a button block directly under each text block then deleted the text block if you do not need it.
Additionally, I would suggest checking out our Academy course on Email Design and this Community Post on further insight into adding columns to an email!
Thanks for being a part of the Community!
-Taylor