mmm i agree i don't really like seeing people be ****ty b/c they think they're better at art or w/e than you. it's immature, imo. anyway, i think that you should be too discouraged. i'd been doing adoptables a long time on deviantart and starting out is kinda hard, ill admit. i think you have potential--even though the idea you're presenting right now may not be what people necessarily see when they think of adoptables--adoptables cover a broad variety of creatures, species, and humanoid/anthro designs. i suggest incorporating more of those colors and patterns into fantasy-based stuff like almyki said. you can even make your own species of adoptables that have unique and original traits/accessories.
don't let people get you down because maybe you're not quite at their skill level or that they don't like your drawings. everyone has to start somewhere. i bet with practice and patience, you can sell your own adoptable species.