Warframe has a lot of biomechanical stuff in it, with many complex designs; the wiki should have plenty of close ups of ingame stuff. A lot of fan and even concept art of it can also be found on artstation (not to mention that artstation has a surprising amount of robotic art-thats rare in the west!). Pixiv has plenty of cyborg and robotic stuff as well if you go a-digging too, but...japanese heh. Not a lot of western artists do cybernetic/mecha/robotic stuff sadly, and when they do it tends to be bulkier, real-robot stuff.

I can also suggest looking at 's stuff (cw: transformations, vore; not all of it, but its present). They do a lot of mecha monsterfolk.

Thank you!!! I can take all the help I can get! And I have heard of Warframe. I'll take a look at their stuff too, again, thank you very much!

No problem, glad to help in any way i can!