Alleluia For SATB and Piano

Hello, My name is Rafa, and I am new this is one of my first original pieces. I am sorry it is incomplete. I started working on it today, so the vocal part is played by a Violoncello. I would really like so feedback. I am a Music Education Major, but I just wanted to try something. Please help me make this better.

Great start!  There is actually a section on youngcomposers where you can post incomplete scores, so you can put works in progress there in the future if you prefer. 

Adding in the text on the score would be helpful, since so much of vocal music is about how the text and the notes work together. 

One thing I notice right away is the quick series of tempo changes you have starting at measure 13.  Since they are all tempos at nice round numbers, you might do better by changing the length of the note values instead.  It will sound the same, but that will be easier for musician sight reading the piece for the first time to interpret.  Going from a 60 quarter notes per minute to 120 quarter notes per minute, for example, means you could stay at 60 beats per minute and every quarter note becomes an eighth and every eighth becomes a sixteenth.  

I'll be curious to see what this sounds like when you are finished.  It has a nice sense of motion.