improve image quality

gatsby-config.js

@@ -17,7 +17,14 @@ module.exports = {
       },
     },
     "gatsby-plugin-mdx",
-    "gatsby-plugin-sharp",
+    {
+      resolve: `gatsby-plugin-sharp`,
+      options: {
+        defaults: {
+          quality: 75
+        }
+      }
+    },
     "gatsby-transformer-sharp",
     "gatsby-plugin-postcss",
     {

src/components/GalleryImage/GalleryImage.js

@@ -243,6 +243,7 @@ export const query = graphql`
               placeholder: DOMINANT_COLOR
               # placeholder: TRACED_SVG
               height: 2160
+              quality: 90
             )
           }
           fields {