The color is cool and the body scale is fine. The only thing I'm not sure is the joint you choose. In real world, a mecha with such size might need more strong joint design especially you need to add some heave weapon for your mecha. You can't feel the weight in LDD but it will result your creation sometimes unreal. Try to build with some real brick maybe you'll find what I say~
This is a cool design. The colors are bold and all your little details are nice. I really like how you make our mechs accommodate a pilot, that is a cool feature that requires some forethought to implement. I would recommend that you try a few things to improve the quality of your pictures though. First of all, try bumping up the graphics settings both in LDD and on your computer when you make your screen shots. Also, you might consider doing a screen capture from another photo program rather than using LDD. From there it is possible to sharpen the image, make special effects, and add backgrounds.