Hi emirhan, welcome to bonsaiempire!
For the first work, it's great done, but it has some mistakes: the trunk should be thick at the bottom and how higher you go how thinner the trunk. That's one of the rules of bonsai. And there can't be 2 branches right in the opposite of each other.
You learn much from just giving it a try and experience with some trees. You should buy a bonsai book with the rules of it etc. so if you make your second work, it wil be more beautiful!
Thanks for publicing!
Youri