First welcome to BPN, looks like a really nice image you choose for your first! You have up to 800 pixels on the long side for a post, you only used 375 on your posted image so you can go much bigger. It makes it much easier to see sharpness, noise etc when the image is 800 pixels. Would love to see you repost tis so we can all get a proper look at what you have.
From what you posted it looks pretty darn good, love the colors etc. Please resize it for us!!
To translate all previous ....... start from scratch !!! There ia tutorial in Educational Resources which will be helpful
I like your image Would consider cropping the partial tall grass on the right (its cut off) and I believe you could get a little more color of that bg For these type images I like for the silohuette to be sharp Not always easy since there is not much light Looking forward to many more and pleas ask for anything you need