riversong- I tend to agree, it sounds a little falsetto and a bit unnaturally high. D4 is very high for a speaking voice, female fundamental pitch is usually anywhere from F3 - B3 so you could definitely come down a bit and that would help. Chances are, this is also right where your break is between chest and falsetto voice, so I can understand if it is hard.
It is better though to use the upper range of your chest voice to avoid it sounding unnatural or forced up there
krista- I think your pitch is right where it needs to be, you could work some on changing your pitch up and down more frequently.. that would help. Also it is slightly nasally, I think probably because of the way you are modifying the resonance? Try to relax the muscles not required to raise your larynx. Try placing a finger on your adam's apple and feeling the position of your larynx. Then, try to relax different sets of muscles until you find just the one set that raises your larynx- that might give you a better larynx position to hold. After a while it will become second nature to relax the muscles surrounding
When I modify my resonance, I am basically raising the very back portion of my tongue, but if I raise too much in the middle of my tongue it starts to sound nasally. Imagine lifting the very back of your tongue up and back