diff --git a/src/app/mii/[id]/image/route.ts b/src/app/mii/[id]/image/route.ts
index b224169..e045a1e 100644
--- a/src/app/mii/[id]/image/route.ts
+++ b/src/app/mii/[id]/image/route.ts
@@ -96,6 +96,7 @@ export async function GET(request: NextRequest, { params }: { params: Promise<{
 			headers: {
 				"Content-Type": "image/png",
 				"Content-Disposition": `inline; filename="${filename}"`,
+				"Cache-Control": "public, max-age=31536000",
 			},
 		});
 	}
@@ -103,7 +104,8 @@ export async function GET(request: NextRequest, { params }: { params: Promise<{
 	return new NextResponse(buffer, {
 		headers: {
 			"Content-Type": "image/webp",
-			"X-Robots-Tag": "noindex, nofollow",
+			"X-Robots-Tag": "noindex, noimageindex, nofollow",
+			"Cache-Control": "no-store",
 		},
 	});
 }
diff --git a/src/app/sitemap.ts b/src/app/sitemap.ts
index ba8d012..ea1baa2 100644
--- a/src/app/sitemap.ts
+++ b/src/app/sitemap.ts
@@ -32,6 +32,7 @@ export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
 					lastModified: mii.createdAt,
 					changeFrequency: "weekly",
 					priority: 0.7,
+					images: [`${baseUrl}/mii/${mii.id}/image?type=metadata`],
 				} as SitemapRoute)
 		),
 		...users.map(