Tools: Sketch 3.3.2
First, draw a water tank first.
Create a new rounded rectangle, adjust the transparency, and then resize.
The angle of the water tank, I was directly adding a stroke to draw.
The next step is to add the edge of the tank and draw the concave. Take a look at all the styles first.
Because the water tank has two slices on both sides of the edge, there are three layers of strokes.
The first layer and the second layer are linear gradients respectively.
The first layer is shorter than the second, because the second layer is the inner section of the water tank side.
This is the third layer, where I use the annular gradient, because the top of the water tank angle and the outer section is also specular.
Next is the water tank concave.
This uses two styles, a radial gradient + inner shadow.
Similarly, the outer shadow is also two.
Then draw the water.
Also, first check out the contours of the water section and then adjust the gradient.
There is a "gap" between water and tank, so it is also necessary to have "edge".
Then add ripples to the surface.
The water wave has a total of two layers (path 21, path 22).
Drawing mode: Path 21 is a solid color + stroke, path 22 is a line segment, color itself to see adjust, here is not on the map.