6. Lizards. I hate drawing them as well as dragons. I dont find Lizards cute cept maybe for charmander and even that one I suck at.
5. Vaginas. they are so damn complex unless you want to just draw a slit and call it a day. but to draw a proper one with all the folds and stuff ugh. Also I cant just take off my pants for reference so thats another minus
4. Wings. I get that it looks might cool with wings on your fursona but god does it ruin perspective drawings. want to draw somone from the back? all you can see is these huge ass wings. I dont mind moogle wings tho as they are so short that they dont get in the way.
3. Fat furs. Because drawing fat is so much harder than drawing slims.
2. Feral. As in 100% acurate dog anatomy and such. Im just not good at it :x