Deleted photos from phone when transfering to macbook, how to get back on phone?
When plugging your iPhone into your MacBook, in iTunes when accessing your phone, you should be able to select 'Photos' from the Settings tab on the left, then press Sync Photos, then choose the photo folder that you want to sync back into your iPhone. Then press Apply.

Note: before choosing the folder, you need to create a separate folder containing all the pictures that you want to sync back.