Express Action Sports

None of these people are me, I just want to see what I’m right and wrong in critiquing these peoples position. Can you tell me everything wrong with these riders positions?

1. http://www.google.com/imgres?imgurl=http://www.cilgerran.info/userfiles/file/events/girl%2520horse-jumping.jpg&imgrefurl=http://www.cilgerran.info/events.asp%3Fsubcat%3D94&usg=__e0CjqDQB-kh34Et2MojqpI0gpf8=&h=1163&w=1651&sz=262&hl=en&start=0&sig2=tWOLQp_2o0e4bwmwDpE5yg&zoom=1&tbnid=z3_2ohlF_1XezM:&tbnh=139&tbnw=145&ei=KGwNTenmMYacsQOXksGPCg&prev=/images%3Fq%3Dhorse%2Bjumping%26um%3D1%26hl%3Den%26sa%3DX%26rlz%3D1R2ADFA_enUS382%26biw%3D1259%26bih%3D734%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=423&vpy=117&dur=94&hovh=188&hovw=268&tx=148&ty=95&oei=KGwNTenmMYacsQOXksGPCg&esq=1&page=1&ndsp=26&ved=1t:429,r:2,s:0
2. http://www.google.com/imgres?imgurl=http://www.dedephoto.com/images/sports%2520portfolio/slides/horse%2520jumping-0082.jpg&imgrefurl=http://www.dedephoto.com/images/sports%2520portfolio/slides/horse%2520jumping-0082.html&usg=__McSye-atQ_uvyWLgaH-wRClqlCI=&h=640&w=428&sz=48&hl=en&start=0&sig2=I_XQsxENCpUgpVGjoX-L6g&zoom=1&tbnid=fdsW43-6Kco8SM:&tbnh=139&tbnw=92&ei=KGwNTenmMYacsQOXksGPCg&prev=/images%3Fq%3Dhorse%2Bjumping%26um%3D1%26hl%3Den%26sa%3DX%26rlz%3D1R2ADFA_enUS382%26biw%3D1259%26bih%3D734%26tbs%3Disch:1&um=1&itbs=1&iact=rc&dur=453&oei=KGwNTenmMYacsQOXksGPCg&esq=1&page=1&ndsp=26&ved=1t:429,r:4,s:0&tx=87&ty=76
3. http://www.google.com/imgres?imgurl=http://www.agnr.umd.edu/news/images/JerseyFreshHorseJumping.jpg&imgrefurl=http://www.equinestudies.umd.edu/Extension/ESUnewsletter-Feb09.html&usg=__Gxngrqw9dalRU2iPJRILW3x85qQ=&h=480&w=607&sz=272&hl=en&start=0&sig2=Du3AbHq4SPuTNLS8T7V6Tg&zoom=1&tbnid=sQ15-J3klBjACM:&tbnh=127&tbnw=166&ei=KGwNTenmMYacsQOXksGPCg&prev=/images%3Fq%3Dhorse%2Bjumping%26um%3D1%26hl%3Den%26sa%3DX%26rlz%3D1R2ADFA_enUS382%26biw%3D1259%26bih%3D734%26tbs%3Disch:10%2C220&um=1&itbs=1&iact=hc&vpx=980&vpy=327&dur=1156&hovh=200&hovw=253&tx=147&ty=105&oei=KGwNTenmMYacsQOXksGPCg&esq=1&page=1&ndsp=26&ved=1t:429,r:25,s:0&biw=1259&bih=734
4. http://www.google.com/imgres?imgurl=http://www.yourhorse.co.uk/ImgGalleryTn/22/13422/1339_4427.jpg&imgrefurl=http://www.yourhorse.co.uk/Community-Landing/Forum-Landing/Forum-Categories/Topic/%3Ftopic-id%3D5700%26start-page%3D10&usg=__vzQe9qVDiV4Je-Dzst4zyRmxt4s=&h=325&w=314&sz=71&hl=en&start=0&sig2=5sW_IbU9mzXIEzRQVMFOxQ&zoom=1&tbnid=wlir3RYvzUiz4M:&tbnh=142&tbnw=139&ei=Em0NTbbwH4aisAPc1ZSNCg&prev=/images%3Fq%3Dbad%2Bhorse%2Bjumping%26um%3D1%26hl%3Den%26rlz%3D1R2ADFA_enUS382%26biw%3D1259%26bih%3D734%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=293&vpy=62&dur=375&hovh=228&hovw=221&tx=95&ty=116&oei=Em0NTbbwH4aisAPc1ZSNCg&esq=1&page=1&ndsp=24&ved=1t:429,r:1,s:0
5. http://www.google.com/imgres?imgurl=http://media-files.gather.com/images/d265/d865/d743/d224/d96/f3/full.jpg&imgrefurl=http://travel.gather.com/viewArticle.action%3FarticleId%3D281474976762275&usg=__oYi3_3SM3j0sGxt3YBcxSecTDhU=&h=520&w=550&sz=120&hl=en&start=0&sig2=ay8VCr5rqR6YVa53xJyqrg&zoom=1&tbnid=ECXqJ0GUX1flwM:&tbnh=152&tbnw=173&ei=g20NTav9J5S8sQPsibGSCg&prev=/images%3Fq%3Dbad%2Bposition%2Bwhile%2Bhorse%2Bjumping%26um%3D1%26hl%3Den%26rlz%3D1R2ADFA_enUS382%26biw%3D1259%26bih%3D734%26tbs%3Disch:10%2C110&um=1&itbs=1&iact=hc&vpx=310&vpy=270&dur=891&hovh=218&hovw=231&tx=135&ty=137&oei=g20NTav9J5S8sQPsibGSCg&esq=1&page=1&ndsp=24&ved=1t:429,r:13,s:0&biw=1259&bih=734

Thank you.

The first riders leg is to far back,
the second rider is leaning to one side.
the third rider is leaning back to far, his legs are almost in front of the girth.
the fourth rider is practically standing up in the saddle.
the fifth riders back is rounded insted of arched.