Probably ran out of memory. You can try increasing it in php.ini, your .htaccess file or at runtime.
ini_set('memory_limit', '512M');
Then check your logs (app/storage/logs/laravel.log)
Well what do you expect? You give 0 information, no error messages, no code, no sample image, not even what package you are using for resizing images. You can set a max size for the image, either in your form or in the validation (http://laravel.com/docs/validation#rule-size) With Intervention/image you can get the width/height of an image, so you can check the resolution.
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