Go To : Appearance > Customize > Header > Logo
Select Image or Text logo and specify other settings as per requirement.

Retina Logo

Based on retina.js
Optional. Can be enabled via customizer.

Go To : Appearance > Customize > Header > Logo
You will get retina logo image upload field once ‘Retina Logo Support’ enabled.

Needs to create two logo images

• 1st : Normal size [ logo.png ]
• 2nd : Double size with same name and @2x suffix [ logo@2x.png ]

Specify normal size and retina logo, in respective fields

Make sure you are uploading retina logo, if its support enabled. Otherwise it will give 404 error.

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For extensive retina settings for images other than logo you could OFF this via customizer and activate any preferred plugin.