That is GREAT bro! I would suggest moving the Mew a few pixels up in order to make it look like it's in the screen instead of touching the black border. But holy smokes, it looks great!
Hey there! Yeah, I work on it everyday whether it is a little or small. I'm a college student, so I try my best to squeeze in time for one of my three lifetime goals: which is to create a complete rom hack!
You're just replacing the palettes (which is 256 colors). That's why in the tutorial you keep moving unto the next index, in order to replace more and more of the palette. Hope this helps.
Hey! I just finished inserting my titlescreen using a tutorial posted here: http://www.pokecommunity.com/showthread.php?t=228656
You get to insert your titlescreen as a whole entire image instead of piece by piece.
It also allows you to use more palettes! It works flawlessly.