This is the 16859th most frequent Russian word.
собственным
"Собственным" means "one's own" in English.
In this sentence, 'собственным' is used to denote ownership or origin, emphasizing that the project he presented was his own creation.
Он посетил выставку с собственным проектом.
He attended the exhibition with his own project.
Here, 'собственным' modifies 'эскизам', emphasizing that the sketches were personally created by her.
Она решила оформить комнату по собственным эскизам.
She decided to decorate the room based on her own sketches.
In this case, 'собственными' refers to 'силами' (efforts), implying that the task should be completed independently, without external help.