There are some stray white/grey pixels in your preview. I recommend cleaning those up, as they could hold this back from being approved for the gallery.
I also recommend a non-animated preview image. This one is 28kb, which means it won't show up on PJ's front page once this is accepted to the gallery. A non-animated preview should be easier to get under 10kb, which is the limit for front-page thumbnails.
A larger thumbnail like this won't hinder your piece from being approved or from showing up in your gallery, searches, or people's favourites, it'll only affect the front page. So, if that's not an issue for you, you could keep it animated.
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There are some stray white/grey pixels in your preview. I recommend cleaning those up, as they could hold this back from being approved for the gallery.
I also recommend a non-animated preview image. This one is 28kb, which means it won't show up on PJ's front page once this is accepted to the gallery. A non-animated preview should be easier to get under 10kb, which is the limit for front-page thumbnails.
A larger thumbnail like this won't hinder your piece from being approved or from showing up in your gallery, searches, or people's favourites, it'll only affect the front page. So, if that's not an issue for you, you could keep it animated.