You will begin by gathering your foliage in your hand. Then add in the flowers to your fist bouquet. One thing to keep in mind if you use similar flowers is that tulips keep growing in water. You can see that mine are longer than the rest of the flowers, so cut them a bit shorter than the rest of the stems. Once you have gathered all the flowers you want into your fist, place them into the vase and let them fall naturally. This gives a very natural, fresh picked spring flowers kind of look.
This is one of my very favorite flower styles. It looks so beautiful and is easy to do! Let me know if you have questions :)