1. Display small round green check mark icon before 'Verified as valid ... ISO' text. 2. Display small round red cross icon before 'Checksum did not match' error text. 3. Display small round animated spinner before 'Running ISO verification, please wait...' text - this also gives user feedback that program is running and responds.
spinner is in there in 0.2, ticks and crosses would also be nice patches welcome of course :)