Realizing that key parts of this picture are symmetric made it not so difficult - the 50th possibility was it! O:)

SPOILER:
r21/c11-12,13-16,21-22,24-25
r22/c5-6,c8-10,c13,c17,c20,c23
r23/c3-4,c7,c18-19
r24/c2
r25/c1
The gate in top right corner is symmetric, as well as the angel (r19/c11-12,c16-17, r13/c6,c8-9,c12,c14,c16,c19-20,c22), and to the left is a cloud (r4/c3-5, r5/c1-2,c6, r6/c5).
Hope it helps.

Joe Tramp you the real MVP.

These hints are just not enough for me. Any more help please?

Multiple possible solutions. Thank you for the hints Joe Tramp.

I agree Tramp is a saint from the pic. Panoramix should go to hell for this.

PHEW! So, like a year and a half later I finally had the skill and experience to finish this puzzle! Crossing this one off my bucket list ;)

Thank you very much for all the tips! It would not be possible otherwise!