Howdy! This seems like a pretty alright track considering your first go round. There are a few pointers that I'd like to lay on the table for when you hopefully try another piece the next time. <^_->
1. In the very beginning, the bass instrument sticks out a lot and doesn't really integrate well with the strings you have going on there. It's not that a bass couldn't work with strings (believe me, they do!), but the tone of it just sounds like it belongs in something a little more upbeat, like a jazz or rock n' roll track. What do you know about EQing? I think what would definitely improve it would be to just scoop out the mids and let the strings occupy that area on their own. Not sure how much that will help, considering the vst doesn't sound very high-end itself, but I think it would definitely be a start!
2. As for the strings themselves, it seems like you have them set to where there is a lot of attack. Attack is great, but too much can make almost anything sound like notes are being clumsily spliced together. It can have a very interesting effect in some areas, but I don't think that's what you were going for. To offset this, try adding some release to the vst. Release will give your notes more sustain after you, well, release them! It's generally a good idea to have strings with some attack and release coupled together, especially in slower-paced pieces.
3. That piano is waaaaay too dry and overall sounds like a poor quality vst. If you can't afford a decent piano vst or are unable to record a piano yourself, then the best you can hope for is experimenting with effects to at least mask the dryness of it. Reverb is a good bandaid for this kind of problem, but try not to go overboard with it, as it can make your instruments sound very muddy. Pianos have a wide range of dynamics, and that can be hard to translate onto a vst.
4. In pieces like this, there's a lot of variation and subtleties that spice up a mix and go a long way in keeping a listener from getting bored of a track. Try looking into adding some cool FXes and ear candy underneath the instrumentation, or variate the composition a bit more. Making the woodwind lead the only thing that is really changing throughout the piece is not enough, at least for me.
Hope that helps!