Hm I think its fine how it is now, can always leave a comment to say what you like about it.
Otherwise you might get some sort of competition or such, even against yourself regarding amount of likes. Some people might feel insecure if their first project receives so much more likes than their second one for example, even when they put more effort into it.
Just pointing out that it may have a nasty unintentional side effect.
With comments, I think that a few elaborate comments can really make it all more worthwhile than a 100 likes.