There are several techniques for generating 3D fractal art flowers (blooms) in Apophysis. In their simplest form, they are not difficult to make. I have personally used and prefer the following tutorials:
Both the video and graphic tutorial are provided by the same artist. In both tutorials, the artist utilizes Gaussian blur, cross, spherical, julian, zscale, and zcone transform variations. in the YouTube video, the artist reduces the Gamma to enhance shadowing between petals and adjusts the [color] Symmetry to increase color dynamics. I thought this was an especially nice touch and have also adjusted Gamma and Symmetry in my image.
Additionally, the post_depth and sineblur transformation variations were used in the Final Transform (+FX) to improve depth of field. (This is a bit tricky and requires additional steps for bloom fractals… but it is well worth the effort!)