Hi and welcome to the contest! Butterfly is very nice - I like the smaller one more (#17). The wedge above the letter S seems to me too big & sharp (#17). Maybe it would be better to make it look like in #16. And maybe little bit elongate the feelers of the butterfly?
Entry #20 is great! Can I see it in some kind of dark green instead of purple? I guess purple is better for us but I would like to make an idea how it would look like. Thank you in advance.