Its a catch 22, There is always a chance that a person might get inspiration from your idea and and do their own variations, there is nothing you can do about it unless they copy your artwork blatantly. People steal, mix and reassemble ideas. However there is 'nothing new under the sun' so it's most likely that your critter is similar to what someone else has created already.
Keep in mind: It's almost impossible to improve as an artist if you never show your stuff to people to get their input.
What about a humanoid tiger like beast with digitigrade legs chitinous plates, scaled wings and a tail with a mace end that can grip stuff? that's Kinda-sorta origional. Actually I kinda want that now. WTF furries.