Just to revisit something that still continues to be an issue here, if you find that your submissions are getting rejected for the group it's most likely because it falls outside the timeframe covered by this group. From the group description : " **The time period this group focuses on is the Cambrian (approx. 542 million years ago) to the end of the early Jurassic (Toarcian, approx 175 million years ago).** "
This is not a general "dinosaur art" group and so drawings featuring things like T-rex and Dromaeosaurs etc.. will generally be rejected unless they are deemed fitting for the "comics and humor" section, where standards are relaxed.