Nice work, man. I really like it
I'll comment but I might repeat what has already been said.
You've used yellow, grey, and black for the general colour scheme. The amount of yellow on the chest area does not fit the design at all - it makes it look clunky and under-thought-out.
Be careful of too much mirroring re. your textures, as this will greatly depreciate the potential interest and value of your set, once finished. Your line work is very clean and you have demonstrated great potential for this set in terms of design.
If not for the rest of the set at least, re-think the layout of the set's features, as how it is displayed now, lacks depth in terms design and unique features. (Just because the textures are parallel does not mean they have to be identical and/or link in a 'circular' fashion (thigh/knee/shin > thigh/knee/shin).)
Go back to your design and have a think. Why is this line straight, while is this line is curved? How would this robot look if I pulled it from the computer and it stood in front of me - would any of this make sense? If there is a space to fill, great, there is a space to fill. How you go about doing so, and what you add to the space (or do not add), will prove to be one of the defining aspects of your texture set.
You are using repetition in the design of your set. There are arrows on the chest and ab region that differ greatly from those on the feet (curved vs straight edges). The yellow, grey and black shapes along the edging of the thigh and shin are too clumped - the designs on the outside of the thigh, knee, and shin have much better spacing (implement this).
There is a black arrow on the abs region - you can hardly see it.
The glute region is boring and the shapes are overused and do not make sense.