Very nice
Wow for a little "DOODLE" this is very impressive, the one on the left actually looks like an older "HOMER SIMPSON" I like the black around the drawing too I think you could make that into some fancy border maybe ad a few more colors in that part of it to really make for a good art border style, anyways you have some really nice work here and this being just a doodle shows off that great talent so keep that up and hope to see much more from you in the near future.
~~THINGS TO IMPROVE ON~~
As suggested use that black surrounding area as a fancy border with a few additions to it.
~X~