You did a good job with processing for your goal - the horns really do stand out.
If you are using the Attach File option at the bottom of the screen you should stay under 1200 pixels wide or the site software will resample your image down to 1200 pixels. In general it doesn't do as good a job as your own processing. You can upload larger images to the Gallery and then link them if you wish to post larger images up to I think 3000 pixels wide. If you choose the gallery approach you can insert them into your thread by using the small camera icon in the bar above the text editing box.
What a fun event first off! That would be fun to capture. And your processing is perfect! I can imagine those horns getting lost, and you have them visible, and not looking over processed.
There is an issue with Uploading Photos (attachjments). I am not sure what the problem is, and I am looking into it. You can still try to Create your Threads and Upload your Photos, but it is hanging up during the Upload.