To heart directly from Safari on iOS, please follow these steps to get the Heart Button on your mobile device.
Step 1: Add bookmarklet in Safari
Add a bookmark to your bookmark bar with the following address:
Step 2: Sync Safari bookmarks on your iOS device
Open iTunes to and find the setting to sync Safari bookmarks under Info > Other.
Check the box and sync your device.
Step 3: Start hearting from mobile Safari
Navigate to a site you want to heart from in Safari on your mobile device.
Tap the bookmark icon in the lower navigation and tap Heart Button to select which image you would like to heart.
Add a description and tags, select an optional collection, and hit post. The image will be added to your account.