1. It's so Tom. (It means a photo. There is Tom in the photo.)
2. It's Tom himself. (It means a photo. There is Tom in the photo.)
3. Winer and loser are distinguished by a small difference.

Do they look natural?

I will give you some explanation about 1, 2.
I want to make similar sentences like "He is so American."
But, I want to put [name like Tom, Sarah...] instead of [American].
I think 1 is wrong and 2 is correct.

Thanks in advance!

Question

1. It's so Tom. (It means a photo. There is Tom in the photo.)
2. It's Tom himself.  (It means a photo. There is Tom in the photo.)
3. Winer and loser are distinguished by a small difference.

Do they look natural?

I will give you some explanation about 1, 2. 
I want to make similar sentences like  "He is so American."
But, I want to put [name like Tom, Sarah...] instead of [American]. 
I think 1 is wrong and 2 is correct.

Thanks in advance!

Answer

Contect will matter.
1 - "It's so Tom." could be said if there is something a bit unique or ideosyncratic about the picture of Tom, like him doing something or dressed in some way that would be very characteristic of Tom or Tom's personality.

2 - "It's Tom himself." sounds a bit awkward to me. If you're just saying the person in the picture is really Tom and not someone else then "It is Tom." is all that is needed.

3 - That works, but small typo -- winner not winer. I think words that end in a single consonant will typically repeat the consonant before adding the "er" ending. (see https://www.yourdictionary.com/articles/suffix-spelling-rules if interested)

Verpassen Sie nicht die Gelegenheit, bequem von zu Hause aus eine Sprache zu lernen. Stöbern Sie in unserer Auswahl an erfahrenen Sprachlehrern und melden Sie sich jetzt zu Ihrer ersten Unterrichtsstunde an!