Leaves alone are not often sufficient to give accurate ID for most trees.
For more accurate ID need to check: leaf shape and size (need scale in a photo), leaf arrangement on the stem (alternate or opposite), bark on trunk and branches, overall shape (growth habit), flowers or fruit, location (tropical, arctic, mountain, swamp, desert, coastal, garden, street, etc).
Each of the above can rule in or rule out some species to make an ID more likely.
Clearer and closer photos = better ID