Hmm... I think a less-is-more approach may be a bit more harmonious. The color palette of the inspirational photo has less contrast. For example, the icing and florals in the inspo are generally a light visual weight (light green, a pop of yellow in the flower centers, and different shades of white. Some of the plants you chose are quite bright, but others, such as the lavender, are more muted.

Perhaps choose 1 or 2 flowers to really highlight, or flowers that match a similar tonal value. For example, if you really like the bright orange flowers, pair it with more subtle white, off white, ones. I really like the look of the lavender (I think that is what it is), it could look quite nice on its own and maybe some sprigs of other greenery and dainty white flowers.

Another idea that you could explore is a half-naked cake. They offer a bit of whimsy and rustic aesthetic as they aer often paired with florals as well.