The problem I see here is that your picture is not a picture of an eagle, it is a landscape featuring an eagle. As such, you can't expect the eagle to be a high-resolution image. To make that eagle something like high-res, you would need (rough guess) 100 times as many pixels. 10x horizontally and 10x vertically - 100x. You can work out exactly how many by checking the pixels in your eagle with another similar-size picture you consider to be sharp enough.

Unless you only want a modest improvement, like 2x (needing 4x the pixels), this is impractical. What you need is to decide if you are taking landscape or wildlife pictures. If landscape, you're fine, but if you want wildlife, you need a longer lens or getting closer. Or both. I do not see any camera available to the general public solving your problem. Perhaps NASA could help?