Please critique my workout...

[EPC]

I would like your opinion on my workout to see if I should make any changes or what not. As of right now, it is very limited due to stress fractures in both tibias (don't ask). My workout consists of the following:

Pushups
35 reps, 10 sets
25 reps, 6 sets
20 reps, 5 sets
I do them facing a mirror to make sure my upper arms are parallel to the ground. I go up until my arms lock.

I do flutter-kicks in place of situps to save putting unnecessary pressure on my shins from placing my feet under objects. 50 4-count reps, 20 sets. Done from 6+ inches off the ground up to a 45 degree angle.

I do lat pulldowns instead of pullups because I have no pullup bar.
150 lbs. 25 reps, 20 sets

I do pushups one day, then the flutters & pulldowns the next and alternate so I'm doing something everyday. I know I need improvement and have PLENTY of work to do, but I want to workout like the QP's do so I thought I'd ask here. Thank you all very much in advance for all replies.