I will say that you are doing ok for a newbie to photoshop, and those are pretty decent for someone at your level. JUst master the filters of photoshop, and then once you have done that you can move on to brushing and learn how to use filters with your brushing. After that, learn to do that + 3d renders with your work, and then you will be good. For now, to be honest I give you a 4.5/10 because they aren't great, nor are they really 'abstract'