How I can get higher DA for sub-domian?

[egskylife]

I have created a sub-domin https://travellife.egsky.net, Should it be treated as an independent site with regard to the site map and the internal links between it and the main domin  egsky.net .which is better to obtain a higher Domain Authority?

For example, when I adding a photo image for the sub-domin, Is it  added on site map of the sub-domin or added for the 2 sites?

Luxor-and-Aswan-Nile-Cruises-e1609000647702.jpg

[maxi0218]

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[Guest]

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