The city itself is a marvel of ancient engineering and artistry. Stone and timber structures rise along the dinosaur's spine, meticulously crafted to fit the contours of its body. At the highest point, near the T-Rex's shoulders, stands a grand castle with soaring towers and fluttering pennants bearing the city's crest. The castle's stone walls are adorned with intricate carvings depicting heroic tales and legendary creatures.

Winding down the creature's back, a network of cobblestone streets and wooden bridges connects various districts of the city. Elegant archways and balconies overlook the jungle canopy, offering breathtaking views of the endless sea of green. Houses with thatched roofs and colorful stained-glass windows cluster together, their chimneys puffing gentle wisps of smoke that blend with the mist of the jungle.

Suspended gardens hang from the sides of the city, overflowing with exotic plants and vibrant flowers that attract hummingbirds and butterflies. Water from a crystal-clear spring near the T-Rex's neck cascades down in a series of waterfalls, ingeniously harnessed to power water mills and fountains throughout the city.

The inhabitants, dressed in medieval attire, bustle about the streets. Merchants display an array of goods in the bustling marketplace—spices, textiles, and handcrafted wares—while musicians play lutes and flutes, filling the air with melodic tunes. Knights clad in gleaming armor patrol the ramparts, ever vigilant, while scholars and artisans engage in animated discussions in open courtyards.

Lanterns hang from ornate iron posts, their golden glow beginning to flicker as dusk approaches. The T-Rex's gentle movements are accommodated by the city's flexible design; suspension bridges sway slightly with each step, and buildings are reinforced to withstand the motion. Vines and mosses from the jungle have been artfully incorporated into the architecture, symbolizing a harmonious coexistence with nature.

Below, the jungle teems with life. Ancient trees with sprawling roots and thick canopies are home to a multitude of creatures—exotic birds with iridescent feathers, chattering monkeys swinging from vines, and elusive big cats prowling the shadows. The air is rich with the scents of damp earth and fragrant blossoms, and the sounds of wildlife create a symphony that underscores the city's own lively hum.

Above, the sky transitions into a tapestry of warm oranges and purples as the sun sets, casting a magical glow over the entire scene. The medieval city on the back of the gigantic Tyrannosaurus rex stands as a testament to ingenuity and adaptation, a thriving haven where civilization and the primal world are intertwined in breathtaking detail.

1. Original image (movie image):
   
2. Outpainting:
   
3. Retexture to oilpainting:
   
4. Upscale the end result