Check out 5 Unity packs from Kronnect that would help you add a realistic look or a camera effect to your scene in no time. 

Beautify 2

Improve the image quality of your scene in real-time with Beautify 2.

Key Features:

• Enhances visual features, restores or augment image detail, producing sharp images - in many cases the change can be dramatic, like switching to High Definition.
• Improves pixel color when needed, without oversaturating the image.
• Removes the extra blur caused by many antialias post effects.
• Reduces or completely removes banding artifacts in gradients, usually seen in skyboxes due to color quantization.
• Improves perceptual texture quality - even low-resolution textures look better.
• Works with forwarding and deferred rendering paths as well as linear and gamma color spaces.

Volumetric Fog & Mist 2

Grab a shader for volumetric fog and mist production.

Features:

• Fog areas: create any number of fog areas, of any size and features.
• Fog voids: now you can create several fog voids easily in the scene making 3D holes into the fog.
• Multiple point lights: which can illuminate the fog with additional global controls for intensity and range.
• Native URP directional shadows including cascade option.
• Fog of war with interactive editor which allows you to paint, clear or color the fog areas with a brush or using scripting.
• Terrain fit option: ability to adapt to any kind of surface below the fog.
• Sunlight diffusion and specular effects.
• Wind speed and direction
• Turbulences.
• Profile-based: create and share settings among multiple fog areas or scenes.
• Fly-through-clouds: create floating clouds that can be crossed.
• Works in SceneView as in GameView.
• Volume-based rendering: it does not use Post Processing Stack. It's not a camera effect.
• Simple workflow: add fog volumes as you would create and move/scale gameobjects.
• Optional custom depth prepass render feature to account for specific transparent object support like lakes, ocean, rivers, etc.

Volumetric Lights

Check out a solution for a fast volumetric light creation. 

Features:

• Smooth or 3D noise based volumetric effect.
• Profile based. Share settings among lights.
• Real volumetric effect.
• Shadow occlusion.
• Dust particles.
• Colored cookies.
• Customizable boundaries.
• Fast!

Compatibility:

• Unity 2019.3+.
• Built-in Pipeline.
• Universal Rendering Pipeline 7.2.0+.
• VR Multi-Pass and Single Pass Stereo support (only built-in pipeline).
• Perspective and orthographic camera support.
• Timeline / Animation support.

Global Snow

Add realistic snow to your scene with Global Snow shader. 

Some details:

• PBR Relief Mapping, a full PBR + optimized volumetric approach which produces a 3D effect of snow bumps.
• PBR Normal-mapped snow, uses albedo, normals, and specular workflow.
• Flat shading, a faster mode without normal modification which still looks great!
• Simplified unlit mode, simple yet convenient effect.
• Integrated Occlusion and Glitter.
• Unity shadow system compatible.
• Compatible with Global Illumination.
• Compatible with Deferred and Forward rendering paths.
• Compatible with Gamma and HDR color spaces.

Sun Flares HDRP

Check out a sun flares HDRP that would help you add realism to your project.

Features:

• Sun disk
• Corona rays
• Light diffraction with animation
• Ghosts with circular, hexagonal, pentagonal or octagonal shape
• Halo with chromatic aberration
• GPU-based, all features render in a single pass
• Depth-based automatic effect occlusion
• Volume-based, Post-processing effect