they are okay for a first attempt but try to colour the outlines and don't keep them only black and for ho-oh don't keep the lightest shade in the same line of pixels as done in the original it looks more like a recolour in your method
Aerodactyl is just a recolor, but the Ho-oh is pretty good. Don't be afraid to change the outlines of shades, especially when you got rid of the dithering on the back/wing. Another tip - don't use white as the lightest shade of a color.
the outlines still too dark, try adding on another light shade.
The actual shading is also very unedited. You have to make the shading custom, you cant just get rid of the dithering.