Learn how to create a realistic water droplet on your photos. Here we cover the use of the gradient tool, overlay
Blending mode controls how the layer interacts with other layers. For example, the blending mode "multiply" looks at the color of your layer and multiplies the base color by the blend color. The result is always a darker color. Multiplying with black results in black, multiplying with white leaves the color unchanged.
Damaker, make sure you're only apply the effect to the droplet layer and not the background image. And remember to keep the brush size and pressure low.