Cat Eye Realistic Exercise

NOTE: I will only take a look at the cat's head

The cat's head is a a practice but for that it looks really good. In fact I think you did a pretty good job on the fur (well I could sue a little help myself with fur-drawing subject). You tried not to have a "line where the head ends but the fur reaching beyond.
While taking a close look I discovered you tried to add some shading as well, which is barely noticeable but amazed me the more as I saw it. Maybe u should try to get more shading within the picture but since I guess the yellow thingy on the other side is your light source it is okay then ^^
Now the best part of the picture: the cat's eye! this one is so detailed and looks amazing by the details! It is really super realistic and I have to admit I rarely saw a eye drawn this good.
If you keep this drawing up for a whole body and/or headshots you can become an pretty good artist.

But there are some points I have to remark.
The nose is looking pretty good but the muzzle seems to miss the whiskers and lower jaw. The ear at the top seems to be incomplete as well. But these are small mistakes and compared to the shape of the head it doesnt really matter due the shape is a really realistic and good one! (damned it looks like our puss!(the shape))

Little advice for next time add a bg it amkes the pic 1000% more amazing and it amkes the pic eventually tell a story.

All in all The ctas head looks really amazing and besides some little mistakes it shows some potential Keep trying and you will may become a good animal drawing artist! Btw I'd love to see u drawing a full body pic! *-*