To go with what Khal is doing, I can publish content at LeoFiannce first and delay posting at my domain for, say, a month so that search engines have enough time to pick up leofinance.io.
Posting updated versions of pre-LeoFinance content eligible for posting at LeoFinance will give the new content the leofinance.io domain, which means search engines will pick them up. The earlier content was virtually invisible, so the newer versions should be more useful for the leofinance.io domain.
As far as how Google ranks the newer pages, I would add enough updates to make them bona fide new pages. Newer H1 and H2s should help, too, since originally I didn't know much about SEO.
If images don't have much influence on driving traffic to leofinance.io, then I won't sweat it. Even so, I would still try to find a non-spammy way to get them to drive traffic to leofinance.io.
Posted Using LeoFinance Beta