Now that you know how to work intarsia on the knit side and the purl side, keep doing what you're doing, following the chart you're working or whatever design is striking your fancy.
Remember that the threads need to be twisted each time you change colors, and after a few rows you'll probably want to straighten out your threads a bit so you don't make too big of a jumbled mess.
To finish the sample swatch as shown, work the established center pattern for 10 rows, then work 5 rows in red (you can cut your beige and the other red yarn at this point) and bind off.
