Some designs for my first gig - constructive criticism please! *Updated with pic*

Ok I had another go at the tiger tonight and tried to take on board your suggestions. I'll play around with the hairline when I can practise on an actual person but this will do for now. I still put a bit of black around the eyes as I like them to be a bit defined. What do you think?
Old vs New:

I'm only new to this (so feel free to disregard my opinion!) - it looks PERFECT now. Love it. The change around the eyes is a winner!

Much better! I love it!

Yeah!

I love that change!! Nicely done!

The first was good but this is great! I really like the eyes better. Your lines are nice and clean. I have caught myself holding my practice head while I paint to get clean lines. The only problem with that is the kid isn't going to let me hold their head in my lap or flip them upside down to get clean lines. I have to make myself not hold the practice head and leave it on the table. I'm thinking part of my problem is not using really good brushs to get my paint to flow on a smooth line. I wanting to purchase some in about a week (lack of funds). Right now I have face painting brushes I bought at the hobby store and some One Stroke brushes I've had for years and God only knows where the rest came from.

Here's my latest attempt at Spiderman...

Old vs New:

Great improvement! It flows so much better now!

I like the thickness (or thinness.. I should say).. better. You could actually bring the lines at the center EVEN closer (to signify the center of the web), but MUCH better! You are brave to put your pics up for criticism! I'm sure all of my stuff would get ripped apart!

See how the lines are basically touching between the eyes then go outward and up. I could totally improve my shape too. haven't practiced spidey in a long time!

I have found that the lines in Spiderman are easier to do and look better if they go thick to thin instead of trying to get them all even, symmetrical, and the same thickness all the way through.