He looks a lot different in the 2nd pic than in the first. In the first his shoulder looks very upright and he looks very post-legged behind.

No horse has to have absolutely perfect conformation to do their job well. It will definitely affect how they do their job, depending on how close to the standard they are, but some deviation doesn't mean that the horse is total @#%$.

Here's my mare (for all you people who insist that you only post your own horse)

She's standing underneath herself a bit here, she's really not sickled.
Here's what I don't like about her: She's not particularly large at 15 hands so she doesn't cross over particularly well into english events.
Shoulder doesn't have as much slope as it could, it definitely makes her trot bouncier than other critters I've ridden.
She's long through the back and loin. While she has excellent lateral balance, it can be hard to get her to really collect up to slow down, and she won't be able to do flying changes well enough to go win a western riding class. (too bad, because it's such an elegant class to watch when there's a really fabulous horse out there).
Her neck comes out a little high, and it definitely makes it harder for her to drop off level and stay there.

I like that she has decent, straight legs, a good foot, good hip, well sprung ribs, a good hock set. She has a very clean throatlatch. She is very feminine. She has never had a lame day. She also has the flattest kneed stride I've ever seen. She's way deep under herself behind, and is an absolute metronome when she gets into a speed we can both agree with. She is extremely balanced laterally.

As for stats, she's a 2001 Paint/Pinto mare, out of a Blazing Hot daughter and by Dirty Rocki.

bonus, here's her moving.
I can't equitate to save my life, don't mind me.

Fire away peeps, it don't hurt my feelings none. Why? Because she is what she is. Why should it hurt my feelings if someone points out that she has a weak loin? It's the truth.
I really don't have a problem with people lifting others pics off the web for critiques. You aren't going to see some otherwise weird conformation that you would otherwise, or train your eye. Of course, it's a lot better if you get out of the house and go look at horses in real life, watch them move, ride them and see and feel why their particular little faults make them move the way they do, but this is a start.