diff --git a/README.md b/README.md
index 18fed85..1fcc428 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,2 @@
 # Cache Mii
 Mii Render Caching Server that saves a .png and .tga render of a user's mii for use across SPFN's services
-
-Renderer Used: https://mii-server.cubexmine.dev/
diff --git a/src/main.rs b/src/main.rs
index 6be6e01..236e47f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,9 +7,39 @@ use bytes::Bytes;
 
 static MII_RENDERER_URL: &str = "https://mii-renderer.bloxerhd.co.uk";
 
-async fn request_mii_render(client: &State<Client>, mii_data: &str, ext: &str) -> Result<Bytes, (Status, String)> {
+static EXPRESSIONS: [&str; 24] = [
+    "normal", "normal_open_mouth",
+    "happy", "open_mouth",
+    "smile", "smile_open_mouth",
+    "anger", "anger_open_mouth",
+    "sorrow", "sorrow_open_mouth",
+    "surprise", "surprise_open_mouth",
+    "blink", "blink_open_mouth",
+    "like", "like_wink_left", "like_wink_right",
+    "wink_left", "wink_left_open_mouth",
+    "wink_right", "wink_right_open_mouth",
+    "frustrated", "surprised", "puzzled",
+];
+
+static EXTENSIONS: [&str; 2] = [
+    "png", "tga"
+];
+
+async fn request_mii_render(client: &State<Client>, mii_data: &str, path: &str) -> Result<Bytes, (Status, String)> {
+    let expression = path.splitn(2, ".").nth(0).unwrap_or("normal");
+    let ext = path.splitn(2, ".").nth(1).unwrap_or(".png");
+
     let mii_data = urlencoding::encode(mii_data);
-    let req_str = format!("{MII_RENDERER_URL}/miis/image.{ext}?data={mii_data}");
+    let expression = if expression == "main" {
+        "normal"
+    } else {
+        expression
+    };
+
+    if !EXPRESSIONS.contains(&expression) { return Err((Status::BadRequest, format!("{expression} is not a valid expression"))) };
+    if !EXTENSIONS.contains(&ext) { return Err((Status::BadRequest, format!("{ext} is not a valid file extension"))) }
+
+    let req_str = format!("{MII_RENDERER_URL}/miis/image.{ext}?data={mii_data}&expression={expression}");
 
     let response = client.get(req_str)
         .send()
@@ -45,8 +75,6 @@ async fn request_mii_render(client: &State<Client>, mii_data: &str, ext: &str) -
 
 #[rocket::get("/<pid>/<path>")]
 pub async fn mii_render(pid: i32, path: &str, client: &State<Client>) -> Result<NamedFile, (Status, String)> {
-    let ext = path.splitn(2, ".").nth(1).unwrap_or(".png");
-
     let mii_data = {
         let route = format!("https://account.spfn.net/api/v2/users/{pid}/mii");
         let response = client.get(route)
@@ -94,11 +122,11 @@ pub async fn mii_render(pid: i32, path: &str, client: &State<Client>) -> Result<
                 Ok(hash) => {
                     if hash == mii_data { // Cached images are correct
                         if !img_path.exists() || !img_path.is_file() { // File type was not found - Request data
-                            let img_data = request_mii_render(client, &mii_data, ext).await?;
+                            let img_data = request_mii_render(client, &mii_data, path).await?;
                             let _ = std::fs::write(&img_path, &img_data);
                         }
                     } else { // Cached images are outdated - Update data
-                        let img_data = request_mii_render(client, &mii_data, ext).await?;
+                        let img_data = request_mii_render(client, &mii_data, path).await?;
                         let _ = std::fs::write(&img_path, &img_data);
                     };
                 }
@@ -106,14 +134,14 @@ pub async fn mii_render(pid: i32, path: &str, client: &State<Client>) -> Result<
                 Err(_) => { // Data cannot be read - Request data
                     let _ = std::fs::write(data_path, &mii_data);
 
-                    let img_data = request_mii_render(client, &mii_data, ext).await?;
+                    let img_data = request_mii_render(client, &mii_data, path).await?;
                     let _ = std::fs::write(&img_path, &img_data);
                 }
             }
         } else { // Data isn't saved - Request data
             let _ = std::fs::write(data_path, &mii_data);
 
-            let img_file = request_mii_render(client, &mii_data, ext).await?;
+            let img_file = request_mii_render(client, &mii_data, path).await?;
             let _ = std::fs::write(&img_path, &img_file);
         }
     } else { // Mii data was never cached - Request data
@@ -121,7 +149,7 @@ pub async fn mii_render(pid: i32, path: &str, client: &State<Client>) -> Result<
 
         let _ = std::fs::write(data_path, &mii_data);
 
-        let img_data = request_mii_render(client, &mii_data, ext).await?;
+        let img_data = request_mii_render(client, &mii_data, path).await?;
         let _ = std::fs::write(&img_path, &img_data);
     };