Nice robot you have going on here, but it does need a bit of work. I mean it is obvious you can draw and your robotic elements and parts you have put into this robot are very good. I just find the transfer of this to digital means a bit OFF. I mean, the background looks like you just dragged some lines around it with photoshop but didn`t actually use photoshop to digitally color in your art. I think next time you should give a try at more digital work if you are going to try to mesh them together. I love the sword and the glow it has drawn, but maybe put a shine and glow effect into that sword to really give it some pizzaz.
~~THINGS TO IMPROVE ON~~
Just try making more of a colored piece with photoshop