Heya,
Wow you got up close for that at 55mm! That's some serious elbow crawling!
If you wanted to present it, here's some quick suggestions which maybe have already been given:
1. Straight horizons or crop that part out. If you crop it out, it's not there and not distracting. If you rotate it, the bird will present differently. Up to you!
2. Exposure is down, it's a bit under-exposed. It's hard sometimes to expose a dark subject on a light environment; and vise verse. Increasing exposure will help with this one.
3. You were already low, so that's great. The lower your camera is so that the ground is not behind your subject, the better. This helps with isolation; and you've already done most of this, so that's good.
Very best,