I think the harmonic scope was a bit limited. I have nothing against the key of Db... but in this case, it outstayed its welcome. Have you taken any examinations in advanced harmony or counterpoint?
A bit more on what Ted and awesom_o touched on. One of my composition teachers would have called this the "D-flat blues," meaning just a little too much of the selected key. The perception of movement generally comes from a position of contrast, a juxtaposition (as Ted very well describes). Borrowing from Gestalt theory, it is the flip between two states of being and not the mere existence of multiple states that gets noticed. Movement is an essential component of music. Even within intended ideas of stagnation, drones, or repetitive patterns there exists movement at some level. Even something as simple as moving the same thematic material to a secondary key would bring in more sense of structure. It would also have intensified the Db octaves in the last section through the return to the principal key of Db. If it is a drone you are after, have a look at the Chopin Berceuse. It's a good model for having one thing remain constant, while another thing creates movement. More people interested in improvisation may pick this up if you move it to the Improvisation board.
Ive never taken any exams most of what i know I've learned from just listening to Chopin Liszt and Beethoven which is where i get ideas from.
I agree! I wanted to create an exposition into bflat minor but during improvisation I find it hard to do so but this dflat piece came from a larger improvisation i did in Csharp Minor but the whole of it was over 14 minutes long so i just decided i liked the d flat section more. the c sharp section is very stormy and dark
I'd suggest you work on small scale modulations.
this dflat piece came from a larger improvisation i did in Csharp Minor