I will be moderately picky:
Step 2 doesn't say to repeat on the other side. Nor does step 3.
Step 7 and 8 show valley folds so that you should really end up with the picture for step 10 (but coloured), but then step 9 implies that step 7 should have shown mountain folds.
Step 11 doesn't show to unfold the flaps you just folded.
Steps 14-18 don't show precreases (the double arrow like symbol common in diagrams).
Step 27 is upside down compared to step 26.
Despite no fold being made in 30, 31 is different from it.
You should also mention the folding of the arms that magically crease and flatten themselves in step 31, despite being told the model will not lay flat.
Step 40 is magically different despite no folds made in 39.
Of course there are many things you can improve on. Making sure it is obvious what is a crease and what is an edge/flap is one thing. Another is just general use of symbols. You should draw diagrams so that it is obvious to someone who doesn't read words. That is, you should diagram using the popular symbols used in all the popular origami books.
Anyways, I like the antennae of the robot. It is pretty cute. Here is a picture (because I generally like it when people fold my models, I hope you appreciate it, too):
