We don’t have a common parlance word for those two bits of the palm in English. Do not say “heel” though, that is very wrong.
The medical term in English is “thenar” and “hypothenar”, but if you had just said “based on the palm" that would have been sufficient explanation for another speaker to get it.
That actually seems to be the photographer’s hand, judging from the heels.
(Is that the word? Heels? The two large fatty bits on your palm #NotANativeSpeaker)
We don’t have a common parlance word for those two bits of the palm in English. Do not say “heel” though, that is very wrong.
The medical term in English is “thenar” and “hypothenar”, but if you had just said “based on the palm" that would have been sufficient explanation for another speaker to get it.