The dove signifies peace. The colours (in your vision) indicate the vital, green would be self-giving in the vital, blue the higher consciousness in the vital. So it must be peace casting its influence from above on the vital.
If one concentrates in the head, as many do, it is a mental-spiritual meditation one seeks for; if in the heart it is psychic meditation; these are the usual places where one concentrates. But what rises up first or opens first may not be the mental or the psychic, but the emotional or the vital; that depends on the nature, for whatever is easiest to open in it, is likely to open first. If it is in the vital, then the meditation tends to project the consciousness into the vital plane and its experiences. But from that we can get to the psychic by drawing more and more inwards, not getting absorbed into the vital experiences but separating oneself and looking at them with detachment as if one were deep inside and observing things outside oneself. Similarly one can get the mental experiences by concentrating in the thought and by it bringing a corresponding experience, e.g. the thought of all being the Brahman, or one can draw back from the thought also and observe one's own thoughts as outside things until one enters into silence and the pure spiritual experience.
The spirit ensnared by thee force to delight
Of creation's oneness sweet and fathomless,
Compelled to embrace my myriad unities
And all my endless forms and divine souls.
O Mind, grow full of the eternal peace;
O Word, cry out the immortal litany:
Built is the golden tower, the flame-child born.