First part of my Castlevania SotN demake set
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Ever wondered what SotN would look like if it was ported to a NES 8-bits format?
Then feast your eyes!
Here I portrayed the iconic first part of the game, "Final Stage: Bloodlines". On the first three pictures you see the dialogue (style reminiscent of CVIII), and two screenshots of battle. On the last you see Richter anihilating Dracula with a Hydro Storm.
I tried my best to emulate (Read well: EMULATE) the style of the NES palette and tile placement/restrictions. The whole background (sans Dracula's throne, which is a sprite) on the first three pictures was made with 8x8 tiles and with four colors (Gray, Teal, Red, Black).
Dracula is made with three colors (plus one transparent): Red, White and Black.
Richter is also three colors plus a transparent one.
Dracula's throne is made with sprites using Richter's blue.
On Dracula's second form, the background goes away so that it can appear. It is a giant demon-thing which would consume a lot of memory, thus it must be made using background tiles for memory restrictions (Much like Death's second form on CVIII).
I said "emulate" because even though I did my best to replicate the style, I'm fairly sure this would eat a whole heap of memory on a real NES. I'm not even sure if it is possible to do on it.
However, in my defense, you can see quality like this being applied on the late games released for the system, so think of this like a very well programmed game made on the last years of the NES XD | 
Superb.
I have also tried to do graphics according to the N.E.S. classic games restrictions (with not such happy results as you), and man, it's a pain in the ass being able to do something eye likable.
I would like to point something that surely you'll know, but just in case... there was an easy way to enhance the 3 colors per sprite restrictions, used in late N.E.S. catalogue games.
http://www.gamefaqs.com/wii/950625-mega-man-9/answers?qid=239080
But maybe this way, is even purer,. I just... love it. Kudos!