[Error: Input file is missing]

What are you trying to achieve?

Overlap two images but it tells [Error: Input file is missing].

Have you searched for similar questions?

Yes

Are you able to provide a minimal, standalone code sample that demonstrates this question?

const sharp = require('sharp')

sharp(__dirname + '/background_blue.png')
    .composite([{ input: __dirname + '/skin_blue.png', blend: 'over' }])
    .composite([{ input: __dirname + '/mouth_closed.png', blend: 'over' }])
    .resize(1000, 1000)
    .toFile(__dirname + 'output.png')

Are you able to provide a sample image that helps explain the question?

[lovell]

To avoid compression artefacts, do the PNG conversion earlier. It also looks like you want nearest neighbour interpolation when enlarging.

https://sharp.pixelplumbing.com/api-resize#resize

  const composited = await sharp(__dirname + '/background_blue.jpg')
    .composite([
      { input: __dirname + '/skin_blue.png', blend: 'over' },
      { input: __dirname + '/mouth_closed.png', blend: 'over' }
    ])
+   .png()
    .toBuffer();
  await sharp(composited)
-   .resize(1000, 1000)
+   .resize(1000, 1000, { kernel: 'nearest' })
    .toFile(__dirname + 'output.png')

[ChristianGrieger]

Perfect! Thank you very much 😃