This statue was made according to how the Fifth Dalai Lama saw him in his Praise. I have highlighted in bold the corresponding iconography that matches and forms the main feature of this statue.
Praise by the Fifth Dalai Lama
http://www.dorjeshugden.com/prayers/dorje-shugden-prayers/prayer-by-the-fifth-dalai-lama-to-gyelchen-dorje-shugden/
HUM
Though unmoving from the sphere of primordial spontaneity,
With wrathful turbulent power, swifter than lightning,
Endowed with heroic courage to judge good and bad,
I invite you with faith, please come to this place!
Robes of a monk, crown adorned with rhinocerous leather hat,
Right hand holds ornate club, left holds a human heart,Riding various mounts such as nagas and garudas,
Who subdues the mamo’s of the charnal grounds, praise to you!
Samaya substances, offerings and torma, outer, inner and secret,
Favorite visual offerings and various objects are arranged.
Although, previously, my wishes were a bit dense,
Do not stop your powerful apparitions, I reveal and confess!
Now respectfully praising with body, speech, and mind,
For us, the masters, disciples, benefactors and entourages,
Provide the good and avert the bad!
Bring increase like the waxing moon in spiritual and temporal realms!
Moreover, swiftly accomplishing all wishes,
According to our prayers, bestow the supreme effortlessly!
And like the jewel that bestows all wishes,
Always protect us with the Three Jewels!