(I'm new to blender :) It keeps getting thinner like this when I extend the faces with >E. deleting them leaves a big face-hole at the main body. don't know how to fill it up. I just want this tail to look fatter and less ''poly-ish''(?) If its easier to fix this for me you can download the .blend here https://we.tl/t-UWNdpDSHS8. I just need help.