Questions & Answers about Senin resmin çok güzel.
Why are there two suffixes showing possession in Senin resmin?
In Turkish possessive phrases, both the owner and the owned thing get a suffix. Senin is the word for "you" (sen) with a suffix (-in) to mean "your". Then, the word for picture (resim) also takes a matching possessive suffix (-in) to show it belongs to you.
The word for picture is resim. Why is it spelled resmin here instead of resimin?
This happens because of a rule called vowel dropping. Some two-syllable Turkish words drop their second vowel when you add a suffix that starts with a vowel. So, resim plus the suffix -in becomes resmin because it is easier to pronounce.
Where is the word for "is" in this sentence?
Turkish does not have a separate word for "is". Instead, "to be" is shown using suffixes at the end of the sentence. For "he", "she", or "it" (like "your picture"), this suffix is completely invisible. Simply saying çok güzel naturally means "is very beautiful".