#1 - Black Jacket is Black - no form
#2 - If the heart is the subject, I would move closer. This seems to not be a photo that looks good centered.
#3 - My favorite .... Nice leading lines .... sweet color
#4 - Color balance may be off, but the yellowish tint lends itself to a dreamy feel for this photo so I like it as is
#5 - Horizon is crooked and the subject, as is, is rather boring...perhaps a lower angle would help with finding more separation between the posts
#6 - Horizon is crooked and is a little underexposed but other than that...this would be a nice photo as well
Keep up the practice...you'll get there...wherever it is you're wanting to go....