Adrian here is your first piece of feed back on the images you posted. Reread how to post images not thumbnails, if I can not see it large enough on my screen and mine is 32" I will not bother going and opening thumbnail, that just me.
From the first three images I see a wonderful eye for capturing beautiful colour, and colour combinations (especially so in images #1 & #2). My feedback for improvement is to find backgrounds that are less cluttered and/or position yourself and/or select an aperture to place all the attention on the subject and make the best of the background.
I adore the creative composition of the 4th image.