>>1871207I can't blame you much since you did this from a garbage vector (Use IQDB to find the original image for future versions) but here are some things.
Much of the hair lacks curvature at tips. You want hair to be flowing in a certain direction at all times. Bend the curves at the tips to properly achieve that. You also simplified much of the longer hair. Go the extra mile and properly curve the hair so that it looks nicer. This also applies to the fur on the tail. In order to achieve this, start with only the nodes at the tips. Bend the handles so that you can get the curvature of the tips. Do not overextend handles so that it flattens at the tips. Only get them to bend to the tip, and add another node in between, if needed.
Also smooth out many areas of the hair. You can always unite hair, so if doing some in pieces helps, do that. This will help especially when you are adding hair on top of rounded areas. You should also smooth the chin.
You also have some bugs. The hair on the right clips out over the other (possibly a compound path error). You also have splotches at the tips of two pieces of hair on the bottom left and right.
>>1871228You should redo it in Illustrator this time then. What you created in PS is very lumpy, inconsistent, and has very poor aliasing. Follow the tutorial in the OP, and do it again. It should come out infinitely better if you know what to do.
>>1871316Uploading to Imgur is fine, so long as you don't upload anything over the 5MB limit. It only converts images to JPG if that occurs. Minimalism images almost never get that high in size, due to their simplicity, even at the very high resolutions. He also can't export higher without a loss in quality, since he did it in PS, making it a raster.