Love these! XD They have so much personality! But one thing that helps distinguish crows from ravens is that ravens have a bit of feathers that lay down over their beak where it attaches to their head and they have scruffier throats. Also be weary of the shape of their tail feathers. Study those details in pictures and I think you've got it!
Birds are just hard to draw in general so I think as long as the beak is attached and there is some recognizable form you're all good. ... Those this goes to lead me to say 5 year old doodles don't really count.
That one in the bottom right hand corner has such a great little smirk. >w>