When creating a gallery wall its important to plan and lay out all your pieces so they fit within the confines of a rectangle or square. Frames can be different textures, sizes, mat colors, but have something consistent like all the images are black and white, or all the frames are brass or black creates cohesiveness even if they are different styles. I chose to have all of the frames black, with some black mats and some white mats, but every frame has a mat (I personally think a frame with a mat looks more high end than just a picture in a frame). Some of our pieces already had black frames, but the other frames I picked up from Michaels. Michaels and Hobby Lobby usually have a pretty good frame selection with great coupons and discounts.
Measure your total length and total height and match it up to your board and batten wall. Start with your upper center piece and hang it on the wall. Depending on the placement of the hooks of your frame you might need some spacer boards.
Install 1 or 2 spacer boards (scrap pieces of 1×3’s that were left over from the board and batten accent wall). And install them with 2” brad nails. Insert your nail into the scrap wood or batten and your picture should hang flush hovering over the board and batten!