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```csharp
using System;
using Flurl.Http;

namespace DownloadImage
{
    class Program
    {
        static void Main(string[] args)
        {
            string url = "https://www.ifeng.com/";
            string filePath = "C:\\Download\\ifeng.com.png";

            DownloadImage(url, filePath);
        }

        static void DownloadImage(string url, string filePath)
        {
            using (var client = new FlurlClient())
            {
                var response = client.GetAsync(url).ReceiveJson();

                if (response["error"] == null)
                {
                    var imageUrl = response["data"]["imageUrl"].ToString();
                    DownloadImageToFile(imageUrl, filePath);
                }
                else
                {
                    Console.WriteLine("ÏÂÔØʧ°Ü£¬´íÎóÐÅÏ¢£º");
                    Console.WriteLine(response["message"]);
                }
            }
        }

        static void DownloadImageToFile(string imageUrl, string filePath)
        {
            using (var client = new FlurlClient())
            {
                var response = client.GetAsync(imageUrl).ReceiveString();
                var imageBytes = Convert.FromBase64String(response);
                using (var fileStream = System.IO.File.Create(filePath))
                {
                    fileStream.Write(imageBytes, 0, imageBytes.Length);
                }
            }
        }
    }
}
```