What techniques can you use to composite images seamlessly?

Compositing begins with selection. Opting for compatible images sets the foundation for a harmonious outcome. Not only should they have similar attributes like lighting and perspective, but their thematic elements should also resonate. For instance, a serene landscape might not blend well with an action-packed cityscape, unless that's the contrast you're aiming for. The mood, subject, and atmosphere of the images play a pivotal role in determining their compatibility.

Remember in Photoshop you can group layers and also apply a mask and or effects to that group as well whilst still retaining each layers within masks etc

Masks and layers are the backbone of non-destructive editing in graphic design. Think of them as the safety nets that allow for experimentation without compromising the original image. While layers can be compared to stacking sheets of paper, each with different drawings, masks act as the erasers that reveal or hide portions of these drawings. Their combined utility grants designers the freedom to seamlessly intertwine multiple elements.

With some layer effect styles such as drop shadow or bevel you can set them as global. So the direction etc is uniform on others as well.

Lighting consistency is paramount. Even a minor discrepancy in shadows or highlights can disrupt the immersion of a composite. It's essential to study real-life light interactions and understand how light falls, casts shadows, or bounces off objects. Remember, it's not just about mimicking light but replicating its nuances, ensuring that the final product remains grounded in realism.

Sharpness and blur are integral in directing the viewer's attention. Often, our eyes are drawn to sharper details, making it a valuable tool for emphasizing focal points. Conversely, adding blur can subtly push elements to the background, allowing for a hierarchy in visual elements. Harmonizing sharpness and blur aids in establishing depth, making composites more three-dimensional and engaging.

Authenticity often lies in the details. Digital images, especially those edited heavily, can sometimes lose their organic feel. By adding noise or grain, you reintroduce that analog warmth and texture, bridging the gap between the digital and the real. However, it's a fine balance; overdoing it can be distracting, while underdoing it might be ineffective.

The final touches are like the cherry on top. These subtle refinements might seem trivial individually, but collectively, they can elevate a composite from good to great. It's a stage of reflection, where designers assess the overall balance, coherence, and impact of the composite, rectifying any inconsistencies or distractions.

While techniques and tools are essential, the success of a composite image also hinges on the designer's vision and intuition. Understanding the intent behind the composite, the story it aims to tell, or the emotion it seeks to evoke can guide the technical decisions, ensuring they serve a larger purpose. Additionally, regular practice, feedback, and a keen observation of the world around can refine one's compositing skills. Remember, in the realm of compositing, reality and imagination aren't dichotomous but intertwined.