Nothing beats a good fan art of the megaman series. I do like the cartoon like recreation you've done here. The characters are very comical and very animated for an art piece. I think their expressions and overall coloring choices are spot-on. I like the way you have your signature inside this, but not in an obvious way that takes away from the work. I think the plain yellow background is nice, but if you want to stick to plain backgrounds, then give this a border to spice it up with something that will pop-out more. Well now that we end this review I want to say good job and keep up this great skill.
~~THINGS TO IMPROVE ON~~
Add a border to this for extra spice