Hi! I think you take fine photos! You are being too hard on yourself! If you want to try for better detail (not that any is lacking in these two photos) you might consider using a darker background--not necessarily black, but that would work. Let the light fall slightly off of the object you want to photograph and then set your shutter for the brightest (lightest) area in the frame. This will keep your photo from washing out and should give you a bit more detail.
I really like the color blending in the Vanda merrillii. It looks somehow...dangerous.
I have a question for you about species vandas? Are there (I am guessing that there are) any species vandas that are the dinner plate shape? I have seen lots of vandas, but never really noticed if any were species or not. Thinking back, it seems that all the species ones I remember seeing have had shapes similar to the ones in your post here. Anyway, you seemed like the one to ask. Thanks!